Question

when 40% of a number is added to 42 the result is number itself what is the value of the number

Answer 1

$40\% \: of \: x + 42 = x \ \\ \frac{40x}{100} + 42 = x \\ 42 = (x - \frac{40x}{100} ) \\ 42 = \frac{60x}{100} \\ x = 70$

Answer 2

let the number be x 40% of x is added to 42 the result is that no itself so
X × 40/100 + 42 = x
40X/100+42=X
(40X+4200)/100 = x


4200 + 40X = 100X
4200= 60X
X = 4200/60 = 70