Learn to buy 36 volleyballs, buy less footballs than volleyballs (3/4), how many footballs did you buy?
学习买了36个排球，买的足球比排球少(3/4)，买了多少个足球？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">36 * (1/4)</gadget>
<output>9</output>

<result>9</result>