This year's sixth grade students planted trees on Arbor Day. The first class planted 100 trees, the number of trees planted by the second class was that of the first class (2/5), the number of trees planted by the third class was that of the second class (7/8), how many trees were planted by the third class?
今年六年级的同学植树节植树．一班植树100棵，二班植树的棵数是一班的(2/5)，三班植树的棵数是二班的(7/8)，三班同学植树多少棵？
<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>