GMAT Quantitative Reasoning Practice Test 2

Question : 44 of 100

Marks: +1, -0

If the radius of a cylinder is doubled and so is the height, how much bigger is the new lateral surface area (without the bases)?

Solution:

The lateral surface area of a cylinder is

(2 × π r) ×(

height of cylinder).
The new lateral surface area is

(2 × π × 2 r) ×(

double the height

)=4

times bigger.

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