Class 3 and Class 2 bought three identical volleyballs, paid the salesperson 100 yuan, and got back 13 yuan. How much is each volleyball?
三2班买了3个一样的排球，付给售货员100元，找回13元，每个排球多少元？
<gadget id="calculator">100 - 13</gadget>
<output>87</output>

<gadget id="calculator">87 / 3</gadget>
<output>29</output>

<result>29</result>