Question

in a city 7/20 of population are womens1/4 are children's. find men's popuplation​

Answer 1

Answer:

let the men's population be x

$\frac{7}{20} + \frac{1}{4} + x = 1 \\ \frac{7 + 5 + 20x}{20} = 1 \\ 12 + 20x = 20 \\ 20x = 20 - 12 \\ 20x = 8 \\ x = \frac{8}{20} = \frac{2}{5}$