For school planting, 150 trees are planted in the fifth grade, which is three times the number of trees planted in the fourth grade. How many more trees are planted in the fifth grade than in the fourth grade?
学校植树，五年级植树150棵，是四年级植树棵数的3倍，五年级比四年级多植树多少棵？
<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<gadget id="calculator">150 - 50</gadget>
<output>100</output>

<result>100</result>