Question

The boy : Girl ratio is 4:5. If there are 225 students, how many girls are in the school? answer and proportion answer and proportion breakdown please

Answer 1

`\bf boy:girl\qquad \cfrac{boy}{girl}\qquad 4:5\qquad \cfrac{4}{5}\implies \cfrac{4\cdot (225)/(4+5)}{5\cdot (225)/(4+5)}\implies \cfrac{4\cdot 25}{\stackrel{girls}{5\cdot 25}}`

so, there are 5 * 25 girls.