Question

# $$70\%$$ of the students in a school are boys and the number of girls is $$504$$ find the number of boys in the school.

Solution

## % of  boys + % of girls = $$100$$            70 + % of girls = $$100$$                    % of girls = $$30$$and, number of girls $$=\dfrac{\% \, of \, girls}{100}\times$$ total students                   $$504=\dfrac{30}{100}\times$$ total students $$\Rightarrow$$ total students $$=1680$$$$\therefore$$ number of boys $$=$$ total students $$-$$ no. of girls                               $$=1680-540$$                               $$=1176$$Maths

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