(3/4) of a number is equal to 20% of 30, what is this number?
一个数的(3/4)等于30的20%，这个数是多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 4</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">30 * (4/15)</gadget>
<output>8</output>

<result>8</result>