It is known that the number A is (5/8) of the average number of B and C, then the number A is the average number of A, B, and C.
已知甲数是乙、丙平均数的(5/8)，那么甲数是甲、乙、丙平均数的多少．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">2 + (5/8)</gadget>
<output>21/8 = around 2.625</output>

<gadget id="calculator">(21/8) / 3</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">(5/8) / (7/8)</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>