Originally Posted by pornmasta

yes, that's a possible way to think the problem.
it's 60 when you think it's a math problem.



If you think that the answer is 48, then you consider that you have to complete a serie with only the right part that matters.
so: 12, 24, 36 and 48

But personally i would probably answer: 60...
I just saw an alternative way to think the problem where you conclude that the answer is 48.