There are 55 students in the first class of the third grade and 52 students in the second class. If each student plants 3 trees. How many trees can be planted in total?
三年级一班有55人，二班有52人，如果每个同学植3棵树．一共可以植多少棵树？
<gadget id="calculator">55 + 52</gadget>
<output>107</output>

<gadget id="calculator">107 * 3</gadget>
<output>321</output>

<result>321</result>