On Arbor Day, there are 48 people in the first class, with an average of 4 trees per person; there are 47 people in the second class, with an average of 5 trees per person. How many trees did the two classes plant in total?
植树节时，一班48人，平均每人植树4棵；二班有47人，平均每人折5朵．两个班一共植树多少棵？
<gadget id="calculator">4 * 48</gadget>
<output>192</output>

<gadget id="calculator">5 * 47</gadget>
<output>235</output>

<gadget id="calculator">192 + 235</gadget>
<output>427</output>

<result>427</result>