The students carried water to water the trees. The third grade watered 50 trees, the fourth grade watered 35 more trees than the third grade, the fifth grade watered twice as many trees as the fourth grade, and how many more trees were watered in the fifth grade than the third grade?
同学们抬水浇树，三年级浇了50棵，四年级比三年级多浇35棵，五年级浇的棵数等于四年级的2倍，五年级比三年级多浇多少棵？
<gadget id="calculator">50 + 35</gadget>
<output>85</output>

<gadget id="calculator">85 * 2</gadget>
<output>170</output>

<gadget id="calculator">170 - 50</gadget>
<output>120</output>

<result>120</result>