Question

In a school, 4/5 of the students are boys, and the number of girls is 100.Find the number of boys.

Answer 1

Boys are 4/5 hence girls will be 1/5
total no of girls are 100
1/5=100
4/4=?
=400

Answer 2

Answer:

$\red {Number \:of \:boys }\green {= 400}$

Step-by-step explanation:

$Let \:Total \: students \: in \:the \: school = x$

$Number \: of \: Boys = \frac{4x}{5}$

$Number \:of \:girls = 100$

$\implies x - \frac{4x}{5} = 100$

$\implies \frac{5x-4x}{5} = 100$

$\implies \frac{x}{5} = 100$

$\implies x = 100\times 5 = 500$

$Number \:of \:boys \\= Total \:students - number \:of \:boys \\= 500 - 100\\= 400$

Therefore.,

$\red {Number \:of \:boys }\green {= 400}$

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