Question

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

Answer 1

Let the number be 'x'
40% of number = 40*x/100
40x/100 + 42 = x
42 = x - 40x/100
42 = 100x-40x/100
42 = 60x/100
4200 = 60x
x = 70
Hence the number is 70
Hope it helps.