(3/5) of a number is 9, what is (7/15) of this number.
一个数的(3/5)是9，这个数的(7/15)是多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">9 / (3/5)</gadget>
<output>15</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">15 * (7/15)</gadget>
<output>7</output>

<result>7</result>