Master Wang makes parts. He works for 4 hours in the morning and makes a total of 220 parts. He works for 3 hours in the afternoon and makes a total of 130 parts. How many parts are made per hour on average in a day?
王师傅做零件，上午工作4小时，共做零件220个，下午工作3小时，共做零件130个，一天平均每小时做零件多少个？
<gadget id="calculator">220 + 130</gadget>
<output>350</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">350 / 7</gadget>
<output>50</output>

<result>50</result>