SSC CGL Model Paper 7

Question : 54 of 100

Marks: +1, -0

If the radius of a cylinder is decreased by 20% and the height is increased by 20% to form a new cylinder, the volume will be decreased by?

Solution:

Decrease in radius, 20% =

1/5

Increase in height, 20% =

1/2

\table , \Radius,\Height,\Volume ;\Original,5,5,(5)^2×5=125;\New,4,6,(4)^2×6=96;,,,125-96=29

% Reduction in volume =

29/125×100=23 1/5%

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