The school bought 4 basketballs and 6 volleyballs for a total of 620 yuan. Each basketball is 80 yuan, how much is each volleyball?
学校买了4个篮球和6个排球，一共用去620元．每个篮球80元，每个排球多少元？
<gadget id="calculator">80 * 4</gadget>
<output>320</output>

<gadget id="calculator">620 - 320</gadget>
<output>300</output>

<gadget id="calculator">300 / 6</gadget>
<output>50</output>

<result>50</result>