The number A is 5 times the number B, how much less is the number B than A?
甲数是乙数的5倍，乙数比甲数少百分之几？
<gadget id="calculator">5 * 1</gadget>
<output>5</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

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