The students participated in the Arbor Day activity. A total of 150 trees were planted. (2/3) were planted on the first day, and (2/5) were planted by the sixth graders. How many trees were planted by the sixth graders on the first day?
同学们参加植树节活动，共需植树150棵，第一天植了(2/3)，其中(2/5)是六年级同学植的，第一天六年级同学共植树多少棵？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">150 * (2/3) * (2/5)</gadget>
<output>40</output>

<result>40</result>