Question

in a class there are 49 student if the number of girls is 2\5
of the number of boys find the number of boys in a class

Answer 1

$total \: student \: = 49 \\ let \: the \: number \: of \: boys \: be \: x \\ then \: \\ girls = 49 - x \\ \\ given \: \\ girls = \frac{2}{5} of \: \\ number \: of \: boys \\ 49 - x = \frac{2}{5} \times x \\ 49 = \frac{7x}{5} \\ x = 49 \times \frac{5}{7} \\ x = 7 \times 5 = 35 \\ number \: of \: boys \: = 35 \: \\ hope \: this \: help \: you$