Question

What number when increased by 15% becomes 170

Answer 1

$\frac{115x}{100} = 170 \\ 17000 = 115x \\ so \: x = 147.82$
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Answer 2

From question

(15x/100)+x=170

15x+100x=17000

115x=17000

x=3400/23

Therefore the number is 3400/23