A piece of fabric, 5 meters are used, and there are 3 meters left, how much of this piece of fabric is used
一段布料，用去5米，还剩3米，用去的是这段布料的多少
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>