Question

In a school out of $300$ student $70$% are girls and $30$% are boys. If $30$ girls leave the school and no new boys are admitted, what is the new percentage of girls in the school?

Answer 1

Total students $=300$

Girls $=70\%$

Boys $=30\%$

$30$ girls left

$70\%$ of $300=$ $\frac{70}{100}\times 300$

$=210$ girls

Now girls left $=180$

percentage of girls = $\frac{180}{270}\times 100$

$=66.66\%$