42 people from the second class of the third grade of Shengli Primary School planted trees together, and every 4 people planted 12 trees. How many trees were planted in this class?
胜利小学三年级二班42人一起去植树，每4人种树12棵，这个班共种树多少棵？
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 42</gadget>
<output>126</output>

<result>126</result>