Question

A number increased by 15 % become 391 find the number

Answer 1

Let The Number be "x"

According to the given condition
x + 15x/100 = 391
(100x + 15x)/100 = 391
115x = 39100
x = 39100/115
x = 340

Therefore,

Answer - The Number is 340

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Answer 2

Let the number be 100
15% of 100 = 15
increased number = 115
by unitary method
when increased number is 115, number is 100
when increased number is 1 , number is 100/115
when increased number is 391, number = (100/115)×391 = 340