20% of 60 is exactly 75% of a number. What is the number?
60的20%正好是一个数的75%，这个数是多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/5) / (3/4)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">60 * (4/15)</gadget>
<output>16</output>

<result>16</result>