Q547
If the radius of a cylinder is decreased by 20% and the height is increased by 20% to form a new cylinder, then the volume will be decreased by:
A.
23.2%
AnswerB.
22.3%
C.
32.2%
D.
20.5%
Answer: Option A
Solution
Answer: Option A
Solution:
Radius = 5 : 4Height = 5 : 6
Volume = 52 × 5 : 42 × 6
Decrease % = × 100 = 2.23%