The third graders planted 60 trees, the fourth and fifth grades planted 12 trees three times more than the third graders, how many trees were planted by the three graders?
三年级同学种树60棵，四、五年级种的棵树比三年级种的3倍多12棵，三个年级共种树多少棵？
<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<gadget id="calculator">180 + 12</gadget>
<output>192</output>

<gadget id="calculator">60 + 192</gadget>
<output>252</output>

<result>252</result>