(3/7) of a number is (3/4) of 12, what is this number?
一个数的(3/7)是12的(3/4)，这个数是多少？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/4) / (3/7)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">12 * (7/4)</gadget>
<output>21</output>

<result>21</result>