The ratio of boys to girls in the school chorus is 3:2. If there are 30 girls, how many boys are there?
学校合唱队男生和女生人数的比是3：2，如果女生有30人，男生有多少人．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">30 * (3/2)</gadget>
<output>45</output>

<result>45</result>