The number of A is (5/12), the number of B is (6/7), how much less is the number of A than the number of B.
甲数是(5/12)，乙数是(6/7)，甲数比乙数少多少．
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(6/7) - (5/12)</gadget>
<output>37/84 = around 0.440476</output>

<result>37/84 = around 0.440476</result>