number divided by 15, the quotient is (3/5), what is the number.
一个数除以15，商是(3/5)，这个数是多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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

<result>9</result>