The boys in the Sanyi class planted 150 trees, which is three times the number of trees planted by the girls. How many fewer trees were planted by the girls in the Sanyi class than the boys?
三一班男生植树150棵，相当于女生植树棵数的3倍，三一班女生比男生少植多少棵数？
<gadget id="calculator">150 / 3</gadget>
<output>50</output>

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

<result>100</result>