The footballs bought by the school are basketballs (3/5), 30 less than basketballs, how many footballs are bought?
学校买来的足球是篮球的(3/5)，比篮球少30个，买来足球多少个？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / (2/5)</gadget>
<output>75</output>

<gadget id="calculator">75 * (3/5)</gadget>
<output>45</output>

<result>45</result>