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If the radius of a cylinder is half the . . . .

This topic has 1 expert reply and 0 member replies

If the radius of a cylinder is half the . . . .

Post Sat Jan 06, 2018 3:45 am
If the radius of a cylinder is half the length of the edge of a cube, and the height of the cylinder is equal to the length of the edge of the cube, what is the ratio of the volume of the cube to the volume of the cylinder?

A. 2/π

B. π/4

C. 4/π

D. π/2

E. 4

The OA is the option C .

What are the formulas I should set here to get the ratio? Experts, can you show me how would you solve this PS question? Thanks in advanced.

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GMAT/MBA Expert

Post Sat Jan 06, 2018 11:37 am
Hi VJesus12,

We're told that the radius of a cylinder is half the length of the edge of a cube and the height of the cylinder is equal to the length of the edge of the cube. We're asked for the ratio of the volume of the cube to the volume of the cylinder. This question requires a couple of formulas and can be solved by TESTing VALUES.

IF....
Side of the cube = 2
Radius of the cylinder = 1
Height of the cylinder = 2

Volume of the cube = (side)^3 = (2)^3 = 8
Volume of the cylinder = (pi)(R^2)(H) = (pi)(1^2)(2) = 2pi

Ratio of cube volume to cylinder volume = 8:2pi = 4:pi

Final Answer: C

GMAT assassins aren't born, they're made,
Rich

_________________
Contact Rich at Rich.C@empowergmat.com

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