Question

a number decreased by 30% gives 84. the no. is

Answer 1

Number is 120 because 70% of a no. is 84.

Answer 2

Solutions :-

Q: A number decreased by 30% gives 84. Find the number.

Let the certain number be x

A/q

=> x - 30% of x = 84

=> x - 0.3x = 84

=> x = 84/0.7 = 120

Now,

Verification :-

Substitute the value of x in question =>

=> 120 - 30% of 120 = 84

=> 120 - 0.3 × 120 = 84

=> 120 - 36 = 84

=> 84 = 84

L.H.S = R.H.S

Hence,

The number is 120.