The school bought back 20 basketballs, less than volleyballs (1/5), how many volleyballs did they buy back? What is the column
学校买回篮球20个，比排球少(1/5)，买回排球多少个？列式为多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 / (4/5)</gadget>
<output>25</output>

<result>25</result>