Bunuel wrote:

If the same amount of material is used to make a hollow cylinder and a hollow cube, which one of the two will have a greater height?

(1) The perimeter of the base of the cube is larger than the circumference of the base of the cylinder.

(2) The volume enclosed by the cylinder is 30π.

Hi..

Shank18, you have gone wrong in assuming that material means volume..

Yes, it would be correct of the elements were solid, here they are hollow..

So volume of material use will equal to SURFACE AREA*THICKNESS of each item..

So \(t_1*2πrh=t_2*6l^2\)

We have to find l:h

(1) The perimeter of the base of the cube is larger than the circumference of the base of the cylinder.

\(4l>2πr.....2l>πr\)

Insufficient

(2) The volume enclosed by the cylinder is 30π

\(πr^2h=30π......r^2h=30\)

Not sufficient information given

Combined..

We do not the ratio of \(t_1\) and \(t_2\), the thickness of each..

Insufficient

E

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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372

2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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