Question

a number when increased by40% becomes 42 .what is the number​

Answer 1

let the number be x

x+40x/100=42

x+2x/5=42

7x/5=42

x=5×6

x=30

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Answer 2

Let the number be x

Then,

According to Question :-

$= > x + \frac{40x}{100} = 42 \\ \\ = > x + \frac{4x}{10} = 42 \\ \\ = > \frac{10x}{1 \times 10} + \frac{4x}{10} = 42 \\ \\ = > \frac{14x}{10} = 42 \\ \\ = > x = \frac{42 \times 10}{14} = \frac{420}{14} \\ \\ = > x = 30$

Hence,

The number is 30.