The students watered the trees. The second grade watered 23 trees, 5 less than the fourth grade, and the sixth grade watered three times the total number of the second and fourth grades. How many trees did the sixth grade water in total?
同学们浇树，二年级浇了23棵，比四年级少浇5棵，六年级浇的棵树是二年级和四年级总数的3倍．六年级一共浇了多少棵？
<gadget id="calculator">23 + 5 + 23</gadget>
<output>51</output>

<gadget id="calculator">51 * 3</gadget>
<output>153</output>

<result>153</result>