Xiaoming has 15 stamps, which is 3/4 of the number of Xiaofang's stamps, and Xiaoli's stamps are Xiaofang's (3/5), so how many stamps does Xiaoli have.
小明有15张邮票，是小芳邮票张数的(3/4)，小丽的邮票数是小芳的(3/5)，则小丽有多少张邮票．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

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

<gadget id="calculator">20 * (3/5)</gadget>
<output>12</output>

<result>12</result>