There are 90 footballs in the school, and there are fewer footballs than volleyballs (2/5). How many volleyballs does the school have?
学校有90个足球，足球比排球少(2/5)．学校有排球多少个？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">90 / (3/5)</gadget>
<output>150</output>

<result>150</result>