Question

a number when decreased by 10% gives 72 the number is ?

Answer 1

let the required no. be x
decreased by 10%=100-10=90
90%of a number is 72
so the required no. is 90/100*x=72
x=72/100*90
x=8*10=80

Answer 2

Answer:

The number when increased by 10% gives 72 =  80

Step-by-step explanation:

Given,

A number, when increased by 10%, gives 72.

Solution:

Let 'x' be the number

10% of the number = 10%x

When the number decreased by 10%, we get

x-10%x = x(1-10%)

= x(1-$\frac{10}{100}$)

= x($\frac{100-10}{100}$)

= $\frac{90}{100}x$

It is given that when the number decreased by 10% gives 72, we have

$\frac{90}{100}x$= 72

x = $\frac{72X100}{90}$

= 80

The number when increased by 10% gives 72 = 80

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