If A: B = 3: 5, A = 40, then B = how much.
若甲：乙=3：5，甲=40，则乙=多少．
<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">40 * (5/3)</gadget>
<output>200/3 = around 66.666667</output>

<result>200/3 = around 66.666667</result>