Two groups produced a batch of toys at the same time, and they finished in 5 days. The first group produced 100 toys, and the second group produced 150. How many fewer toys were produced by the first group than the second group? what is the correct formula
两个小组同时生产一批玩具，5天做完，第一小组生产了100个，第二小组生产了150个，第一小组比第二小组平均每天少生产多少个？正确的算式是多少
<gadget id="calculator">150 / 5</gadget>
<output>30</output>

<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<result>10</result>