A and B cooperate to produce a batch of parts. A makes 20 parts per hour for 2.5 hours, and B makes 22 parts per hour for 3 hours. How many parts are there in this batch?
甲、乙两人合作生产一批零件，甲每小时做20个，做了2.5小时，乙每小时做22个，做了3小时，这批零件一共有多少个？
<gadget id="calculator">20 * 2.5</gadget>
<output>50</output>

<gadget id="calculator">22 * 3</gadget>
<output>66</output>

<gadget id="calculator">50 + 66</gadget>
<output>116</output>

<result>116</result>