Question

If 70% of a no. is subtracted from itself, it reduces to 81. what is two fifth of that number?

Answer 1

Let the number be 'x'
x - 70/100 * x = 81
100*x/100 - 70*x/100 = 81
30*x/100 = 81
x = 81*100/30 = 270 
The number is 270
2/5th number--- 2/5 * 270 = 108
Hope it helps

Answer 2

Answer:108

Step-by-step explanation:

let the no. is 100x. so 70% of this no. is 70x

so according to question 70% of a this no. is subtracted from itself, it reduces to 81

⇒70x+81 = 100x

⇒30x =81

⇒x = 2.7

so the no. is 100x = 270

two fifth of this number is = (2/5)*270

= 108