The ratio of a number to (5/9) is equal to (3/4) of 20, find this number.
一个数与(5/9)的比值等于20的(3/4)，求这个数．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">20 * (3/4)</gadget>
<output>15</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">15 * (5/9)</gadget>
<output>25/3 = around 8.333333</output>

<result>25/3 = around 8.333333</result>