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प्रश्न
A is 25% older than B. By what percent is B younger than A?
उत्तर
Alternative Method:
Let age of B = 100 years
∴ Age of A
= 100 + 100 x `(25)/(100)`
= 125 years
Difference in age by which A is older than B
= 125 - 100
= 25 years
∴ % by which B is younger than A
= `(25)/(125) xx 100`
= 20%
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