Xiao Ming originally had 10 yuan. Use up (1/5). How much money is left?
小明原有10元钱．用掉(1/5)．还剩多少钱？
<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">10 * (4/5)</gadget>
<output>8</output>

<result>8</result>