(1/5) of number A is equal to (1/7) of number B, how much more number B is than number A.
甲数的(1/5)等于乙数的(1/7)，乙数比甲数多多少．
<gadget id="calculator">7 - 5</gadget>
<output>2</output>

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

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