There are 30 boys and girls (1/3), how many girls are there? (solution with equation)
男生30人，是女生的(1/3)，女生有多少人？(用方程解答)
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 / (1/3)</gadget>
<output>90</output>

<result>90</result>