Volumes Practice Test 1

Question : 15 of 40

Marks: +1, -0

If the radius of a right circular cylinder is decreased by 50% and its height is increased by 60%, its volume will be decreased by:

Solution:

Change in volume = 60 – 50 – 50 +

{60×-50+(-50)×(-50)+(-50×60)}/{100} + {60×-50×-50}/{100^2}

= – 40 – 35 + 15 = – 60
Hence, volume will be decreased by 60%

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