Question

if the length of a rectangle is increased by 10% by what percent it's width will be decreased so that area remains same?​

Answer 1

Answer:

New l = l + 10/100*l

= 11 l/10

Area = l * b

11 l/10 * required width = l*b

Required width = 10*b/11

So Decrease in width = b - 10b/11

= b/11

So percent decrease = b/11*100

Hence 100/11 = 9.09 per cent has to be decreased in case of width

Answer 2

Answer:

100/11

Step-by-step explanation:

1. suppose l=1
2. area l×b
3. 1×b=100%
4. 1+10×b=100%
5. b=100/10+1

1. b=100/11