The store shipped 20 basketballs, the number of badmintons (5/9), and the number of volleyballs was badminton (11/18), how many volleyballs did the store ship?
商店运来20个篮球，是羽毛球个数的(5/9)，排球的个数又是羽毛球的(11/18)，商店运来多少个排球？
<gadget id="calculator">11 / 18</gadget>
<output>11/18 = around 0.611111</output>

<gadget id="calculator">18 * (11/18)</gadget>
<output>11</output>

<result>11</result>