20% of the number A is equal to (5/6) of the number B. The number B is 10. What is the number A?
甲数的20%与乙数的(5/6)相等，乙数是10，甲数是多少．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(5/6) / (1/5)</gadget>
<output>25/6 = around 4.166667</output>

<gadget id="calculator">10 * (25/6)</gadget>
<output>125/3 = around 41.666667</output>

<result>125/3 = around 41.666667</result>