(5/7) of a number is (9/20), what is this number.
一个数的(5/7)是(9/20)，这个数是多少．
<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(9/20) / (5/7)</gadget>
<output>63/100 = around 0.63</output>

<result>63/100 = around 0.63</result>