Xiao Shuang has 50 stamps, Xiao Hua's stamp number is Xiao Shuang's (9/10), Xiao Ming's stamp number is Xiao Hua's (4/5), how many stamps does Xiao Ming have?
小双有50张邮票，小华的邮票数是小双的(9/10)，小明的邮票数是小华(4/5)，小明有多少张邮票？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">50 * (9/10) * (4/5)</gadget>
<output>36</output>

<result>36</result>