Xiaoming's family bought two batches of piglets and raised them until April this year. The first batch of 3 pigs weighed 66 kilograms each, and the second batch of 5 pigs weighed 42 kilograms each. What is the average weight of each pig in Xiao Ming's family?
小明家先后买了两批小猪，养到今年4月．第一批的3头每头重66千克，第二批的5头每头重42千克，小明家养的猪平均每头重多少千克．
<gadget id="calculator">66 * 3</gadget>
<output>198</output>

<gadget id="calculator">42 * 5</gadget>
<output>210</output>

<gadget id="calculator">198 + 210</gadget>
<output>408</output>

<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">408 / 8</gadget>
<output>51</output>

<result>51</result>