The composition of a kind of beef is 68% water, 20% protein, 10% fat, and how much others.
一种牛肉的成分是水占68%，蛋白质占20%，脂肪占10%，其他占多少．
<gadget id="calculator">68 / 100</gadget>
<output>17/25 = around 0.68</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (17/25) - (1/5) - (1/10)</gadget>
<output>1/50 = around 0.02</output>

<result>1/50 = around 0.02</result>