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