Guanghua Road Primary School bought 1 volleyball and 4 shot puts, which cost 42 yuan. If a volleyball costs 18 yuan, how much is each shot put?
光华路小学买了1个排球和4个铅球，共用去42元．如果一个排球18元，那么每个铅球多少元？
<gadget id="calculator">42 - 18</gadget>
<output>24</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<result>6</result>