Math: can anyone please help me with this question

http://www.admissionstests.cambridgeasse…

question 20 please

i tried to re-arrange and such, but could not do it

any help is much appreciated

answer is A

volume = πr²h
area = 2πr² + 2πrh

volume = area
πr²h = 2πr² + 2πrh

divide thru by πr

rh = 2r + 2h

rh - 2h = 2r

h(r - 2) = 2r

h = 2r/(r - 2)
.

IM IN CAMBRIDGE AT BRADDOCK, TOO! AHH!

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