If (2/3) is (7/8) of A, then A=how much.
如果(2/3)是A的(7/8)，那么A=多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">(2/3) / (7/8)</gadget>
<output>16/21 = around 0.761905</output>

<result>16/21 = around 0.761905</result>