The students watered 23 trees in the third grade, twice as many in the fourth grade, and 18 more trees in the sixth grade than in the third and fourth grades. How many trees did the sixth grade water in total?
同学们浇树，三年级浇了23棵，四年级浇的棵数是三年级的2倍，六年级浇的棵树比三年级和四年级浇的总数还多18棵．六年级一共浇了多少棵树？
<gadget id="calculator">23 * 2</gadget>
<output>46</output>

<gadget id="calculator">46 + 23 + 18</gadget>
<output>87</output>

<result>87</result>