1 each of basketball, football, and volleyball, with an average of 36 yuan each. Basketball is 10 yuan more expensive than volleyball, and football is 8 yuan more expensive than volleyball. How much is each volleyball.
篮球、足球、排球各1个，平均每个36元．篮球比排球贵10元，足球比排球贵8元．每个排球多少元．
<gadget id="calculator">36 * 3</gadget>
<output>108</output>

<gadget id="calculator">10 + 8</gadget>
<output>18</output>

<gadget id="calculator">108 - 18</gadget>
<output>90</output>

<gadget id="calculator">90 / 3</gadget>
<output>30</output>

<result>30</result>