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प्रश्न
A number increased by 15% becomes 391. Find the number.
उत्तर
Let the required number = x
∴ According to the statement,
15% of x + x = 391
⇒ `(15)/(100) xx x + x = 391`
⇒ `x[15/100 + 1] = 391`
⇒ `x[(15+100)/(100)] = 391`
⇒ `x xx(115)/(100) = 391`
⇒ `x = 391 xx (100)/(115)`
⇒ `x = (391 xx 100)/(115)`
= `(17 xx 100)/(5)`
⇒ x = 340
∴ Required number = 340
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