Question

The length & breadth of a cuboid are increased by 15%
& 25% respectively. Find the % change in the volume
of it, if the height is decreased by 30%
(a) 0.625% 0) 6.25% (c) 62.5% (d) 37.5%​

Answer 1

Answer:

1. length=l

breadth=b

height=h

volume (v1)=l*b*h

2.

length=115l/100

breadth=125b/100

height=70h/100

volume (v2)=(115l/100)*(125b/100)*(70h/100)

=1.00625l*b*h

now...

increased volume%=( 1.00625-1)/1*100

=0.625%