Two non-zero numbers A and B, A: B is (5/3), then how much is B less than A
两个非零数字A与B，A：B是(5/3)，则B比A少多少
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>