How much is 3 (1/5) plus 1 (1/5).
3个(1/5)加上1个(1/5)是多少．
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>