Question

if 21 is added in a number. then the result becomes 137 by 1/2% . find the number​

Answer 1

Answer:

Given:

result = 137½%

add no. = 21

Concept:

To convert percentage into fraction we divide it by 100

So 137½% = 275/2% = 275/200 = 11/8

Calculation:

Let, the no. = x

⇒ x + 21 = 137½% of x

⇒ x + 21 = 11x/8

⇒ 11x/8 - x = 21

⇒ 11x - 8x = 21 × 8

⇒ 3x = 21 × 8

⇒ x = 56

∴ The no. is 56.