The school organizes two classes of the sixth grade to plant trees. The ratio of the number of saplings allocated to the first class and the second class is 2:3, and the ratio of the number of saplings allocated to the second class is 150. How many saplings are assigned to a class?
学校组织六年级的两个班种树，一班和二班分得树苗棵数的比是2：3，二班分得树苗150棵．一班分得树苗多少棵？
<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<result>100</result>