On Arbor Day, the sixth graders planted 102 trees, and the fifth graders planted half of the number of sixth graders. How many trees were planted by the two graders?
植树节，六年级同学植树102棵，五年级同学植树的棵数是六年级的一半，两个年级共植树多少棵？
<gadget id="calculator">102 / 2</gadget>
<output>51</output>

<gadget id="calculator">102 + 51</gadget>
<output>153</output>

<result>153</result>