Question

If the length of a rectangular field is increased by 60%, then by what per cent should
the breadth be decreased so that there is no change in area?
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Answer 1

Answer:

method (1)

let length = 10, breadth = 10 ( assume rectangle = square)

area = 10*10 = 100

new length = 16 (60% inc.)

new breadth = x

area = 100 ( as said no change )

so,

x = 100/16 = 25/4

decrease in breadth = 15/4 = 37.5% (Ans.)

Method (2)

we can do it directly by = x*100/(100+x)

= 60*100/160 = 37.5% (Ans.)

[ mark as brainlist if you understand my solution]