The school bought 12 footballs and 8 volleyballs for a total of 900 yuan. Football is 50 yuan each, how much is volleyball each? (solution by equation)
学校买来12个足球和8个排球，共花了900元．足球每个50元，排球每个多少元？(用方程解)
<gadget id="calculator">50 * 12</gadget>
<output>600</output>

<gadget id="calculator">900 - 600</gadget>
<output>300</output>

<gadget id="calculator">300 / 8</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>