The fifth and sixth grades participated in tree planting activities. The fifth graders planted 120 trees, and the sixth graders planted 40 more trees than the fifth grade. How many trees did the sixth graders plant?
五、六年级参加植树活动，五年级学生植树120棵，六年级植树的棵数比五年级的2倍多40棵，六年级植树有多少棵？
<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<gadget id="calculator">240 + 40</gadget>
<output>280</output>

<result>280</result>