There are 20 kilograms of apples, and (3/4) of them are taken away, how many kilograms are left.
有苹果20千克，拿走了它的(3/4)，还剩多少千克．
<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">20 * (1/4)</gadget>
<output>5</output>

<result>5</result>