This year, the students planted a total of 100 trees. Among them, the number of trees planted by the sixth grade is the total (2/5), the number of trees planted by the fifth grade is the sixth grade (7/8), how many trees are planted by the fifth grade?
今年同学们共植树100棵，其中六年级植树的棵数是总数的(2/5)，五年级植树的棵数是六年级的(7/8)，五年级植树多少棵？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">100 * (2/5) * (7/8)</gadget>
<output>35</output>

<result>35</result>