The ratio of number A to number B is 7:8, how much less number A is than number B.
甲数与乙数的比是7：8，甲数比乙数少多少．
<gadget id="calculator">8 - 7</gadget>
<output>1</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>