(3/5) of a number is (2/3) of 15, what is this number?
一个数的(3/5)是15的(2/3)，这个数是多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(2/3) / (3/5)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">15 * (10/9)</gadget>
<output>50/3 = around 16.666667</output>

<result>50/3 = around 16.666667</result>