Teacher Li brought 750 yuan, and after buying 20 volleyballs, there is still 30 yuan left. How much is each volleyball?
李老师带了750元钱，买了20个排球后还剩30元．每个排球多少元？
<gadget id="calculator">750 - 30</gadget>
<output>720</output>

<gadget id="calculator">720 / 20</gadget>
<output>36</output>

<result>36</result>