Zhang Jun has 25 stamps, Li Ming has (7/5) times as many stamps as Zhang Jun, and Wang Li has (4/7) as many stamps as Li Ming, how many stamps does Wang Li have?
张军有25张邮票，李明的邮票张数是张军的(7/5)倍，王丽的邮票张数是李明的(4/7)，王丽有多少张邮票？
<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">25 * (7/5) * (4/7)</gadget>
<output>20</output>

<result>20</result>