$5 via PayPal to the first person who figures out this equation (geometry)
 

I need to now how many 18" pizzas fit into a 22" pizza.

Use this chart:

18" pizza = 1.25 16" pizza
18" pizza = 1.65 14" pizza
18" pizza = 2.25 12" pizza
18" pizza = 3.25 10" pizza
18" pizza = 5.00 8" pizza

The first one who answers correctly and tells me the formula used gets $5 PayPal, my gratitude and props for being a GFY math wiz.

Just one. Two pizzas won't fit. :-)

Did you used to sit next to me in Geometry class and not pay attention as well? :error

A = pie d^2/4
d= 18
d=22
A22/A18 = 380.13/254.47 = 1.49 or 1.5

oops... I used radius (the first time)... above is correct with diameter. Doesn't matter though... still the same proportion

pi*R^2

3.14*9^2=254.34 in^2 for the 18"

3.14*11^2=379.94 in^2 for the 22"

379.94/254.34 = 1.49 pizzas, depending on how you round and significant figures.. :upsidedow


Edit: damit Beaner, I wanted to get a pizza with Paypal.... lol

Impressive! Looks legit (meaning I don't understand the formula, but I could see it being 1.5.

What's your paypal email address?

Give me your email address to: I'll gladly pay another $5 for your effort and confirmation!

If you want to, and thank you. :upsidedow
col.mike7 at yahoo.com

PayPal sent - Thanks again. Still waiting for Beaner's address.

X = 324/(Diameter*Diameter)

i.e. 18" pizza = 0.67 22" pizza

Got it, thanks! I'm seriously ordering a pizza with it in a minute since places around me take Paypal for some reason. :winkwink:

Let me know if you have any more geometry/algebra/calculus questions.

To explain to my kid I go
18" pizza if it was square thats 18*18 but its not its 1/2 the area so 18*9 = 162
now take a 22 inch pizza cut the middle 18 inches out you're left with a 4 inch wide ring. that ring is 20inches long (18+22/2) so (20*4) so total 22" pizza area is 162+80 242/162 = 1.5 give or take

Awesome! I'm putting you on speed dial for all mathematical problems. Enjoy the pizza!

A = Area of a circle. You just find the area of 22" pizza, area of 18" pizza, divide the bigger area by the smaller and get 1.5.

Cool - now what's your PayPal email, so I can send you $5?

Thin or thick crust?

That was a factor in a *challenge* assignment my daughter had last year. From recollection it was ingredients needed... so volume came into play. It was def. a tough question for a fifth grade assignment.

there are some awesome mathematicians on gfy :thumbsup

I thought you looked familiar. :pimp

:1orglaugh :1orglaugh

More like people have to be high school drop outs to not get it right.


A pizza is a circle, the volume(area) of the circle is pi*r^2

r = 1/2 the diameter of the pizza; pi = 22/7 approx(3.14)

find the area of both pizza's then do the ratio

((3.14)*11*11) / ( (3.14)*9*9) = 1.49

Volume is three dimensional... needs depth to make it volume. Volume (area) are NOT the same :thumbsup

True, but we don't know the thickness of the pizza therefore it's calculated as Area.
But in reality we are dealing with volume of pizza and we assumed both pizzas to have the same thickness.

:pimp

Mike for the win!

Here's the real answer
 

The question is to find the ratio of larger sized pizza to a smaller sized pizza.

Yes, the formula for area is A = pi * (d/2)^2 = pi * d^2 / 4

What is important that you need a ratio, and for this you don't need pi. The only thing you need is this: 22^2 / 18^2, because everything goes away. In fact, you can reduce it further to 11^2 / 9^2 which is 121 / 81. This is same as (11/9)^2.

It all comes to 1.4938271604938271604938271604938

Same thing slower:
Say Ab is area of big pizza, and As is area of small pizza.
db is diameter of big pizza = 22; ds is for small = 18.

Ab = pi * db^2 / 4
As = pi * ds^2 / 4

Ab/As = [pi * db^2 / 4] / [pi * ds^2 / 4] = db^2 / ds^2

Agreed - So the answer to the question as asked is:

1:1.49

Can you send me 5$ please?
I'll return the favor in anyway I can.

fuck math!!!!!!!!!!!!! lol I just slept and bitched and cheated. If I was on adderal , I got shit donnneee.

The correct answer (somewhat) is how Project Manager did it without pi. The reason why...because the question didn't ask you to solve it with a standard formula..ie..area of a circle. It said use the following chart. Also, this is an algebraic problem, not a geometry problem.

This is similar to introductory algebra problems that give a chart of x,y coordinates and asks the student to graph a line or function from them. Basically connect the dot. It's much different if you only give the student two sets of coordinates and ask them to figure out the slope(,) y1-y2/x1-x2 and then take that and then figure out y=mx+b to graph it. If you want to know what kind of answer you have to give, you need to understand exactly what question you are being asked...and what constraints you are under. In this case....simply using the chart. Otherwise you would have been given all the area formulas for the problem..

Project Mangers way...is correct, but probably not what they are looking for..

22^2 / 18^2

The reason you don't need to use PI in the formula is because it's a constant between the both sizes.

The more true method to using the chart is to take the given data and solve for X where X equals the rate of area expansion per 2 inches...or whatever other relational data you can obtain from the chart between the sizes...ergo...per example..filling out the next value for 18" would be a 1.00 value because of the 1:1 equal ratio

18" pizza = 0.65 22" pizza
18" pizza = X.XX 20" pizza
18" pizza = 1.00 18" pizza
18" pizza = 1.25 16" pizza
18" pizza = 1.65 14" pizza
18" pizza = 2.25 12" pizza
18" pizza = 3.25 10" pizza
18" pizza = 5.00 8" pizza

I dont' need the five dollars. I'd like to see who here on the board can actually solve it the right way. The person who figures it out just using the chart and posts the method will be the true person that earns the 5 bucks...

Also...its pretty clear they are rounding numbers to the nearest tenth or half tenth. Which would be 1.5. If you want to get technical and really answer the question by fitting shit into the chart...the number they are looking for is actually the other way..which would be .65 (hint on how to solve it if you look at the chart)

some people must be really hard up for $5 :1orglaugh:1orglaugh

wtf Einstein is proud after reading this all :)

@timlover... lol

The answer/pattern has already been posted. The pattern is the square of each divided.

Randy, pleasure speaking with you today and we are going to fuck things up!

I don't think you read what I wrote. I wasn't disputing the answer.

There are multiple ways to come up with answers in math. Multiple ways to express it. You have to understand clearly what is given, what conditional boundries exist, and what is expected as a result.

It's a good exercise to practice precision in comprehension and finite expression. Which is why most people find math difficult...

If you're asked to screw in a light bulb and you're given a hammer as a tool. It doesn't mean pick up the lightbulb and screw it in with your hand. The objective isn't to get the light bulb screwed in. It's how to utilize the hammer.

In this pizza example. If the purpose was to simply divide the squares, there would be no damn purpose for the chart that was given.....because it serves absolutely no purpose for that method you suggest. You need none of that data. So obviously that data is given for a reason. That would mean the objective and solution is to find a method that utilizes the data from the chart under normal math principles....not complex forumulas like area of a circle...etc...

This is a math exercise in comprehension and how to use a data set. Not an exercise in figuring out the areas of circles using formulas...

Not sure if serious. Anybody who can not solve this 6th grade question in 5 minutes is really stupid. And I am taking into consideration the fact that people tend to forget math after school because if you were actually in 6th grade you would be stupid if you did not solve this in 30 seconds.

I've never had a man lick my ass before but for $5 what the hell. Money sent.

edit: nvm, read it wrong and failed at a joke.. :Oh crap

Beaner, the pleasure was mine. Really excited about moving ahead.

Then by your standards, I'm really stupid.


Here's the deal: I really did need the answer to the formula (Thanks Beaner, Colmike7, ProjectManager, Timlover, wehateporn and the others who participated.)

Yes: I could have figured it out myself.

No: I could not have figured it out and confirmed my answer in less than 5 minutes.

So if that makes me stupid, so be it. But I was smart enough to know where to get the answer in a timely and fun manner. And as an extra bonus, this thread lead to an introduction to a contact that could be instrumental in developing my online business.

Looks smart to me all the way around.:winkwink:

We are really beating a dead horse. But again, the *pattern* by looking at the tables is to square the numbers then divide, by doing so, you get the answer. That is the pattern.

Like when you get a matrix of numbers, and one is left blank, you need to find the pattern. Sometimes it is simply the last number -1. I.e. 576, 996, 86, 6, 455, 35, 265, 77, X

What could X be? 997, 855, 324, 1 ? Which one is it? There is a pattern.

The answer to OP question is solved by the areas... the pattern is recognizing that all you need is the radius, or diameter.

No offense meant. I just hardly can imagine anyone who does not know Area = π × r2 ...

The formula("pattern") is just X = ((pi)a^2)/((pi)b^2) or X = (a^2)/(b^2)

Where x is the ratio, or how many pizzas will fit. a is the radius of the pizza that b radius pizzas are going into.. Then rearrange and explain it how you want. :upsidedow

surface:
pi*R²

piR²=x piR'²
R²=x R'²
x=R²/R'²
x=22²/18²
x= 1,49383

fuck all that, it only takes 1.

Take an 18" thick crust dough, raw.
Roll it out to 22".
Take the same toppings you'd put on an 18" pizza and spread them out.

You now have a regular 22" (discount) pizza.

When I worked at a pizza place, they used to stretch medium hand tossed dough to a large when large shells were all gone.. Without a discount... :Oh crap