The number A is 50, the number B is 80% of the number A, and the number B is 62.5% of the number C. What is the number C?
甲数是50，乙数是甲数的80%，乙数是丙数的62.5%，丙数是多少？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">62.5 / 100</gadget>
<output>0.625</output>

<gadget id="calculator">(4/5) / 0.625</gadget>
<output>1.28</output>

<gadget id="calculator">50 * 1.28</gadget>
<output>64</output>

<result>64</result>