A total of 240 trees were planted in each grade of the school, among which the upper grades planted (2/3), and the number of trees planted in the fifth grade was (1/2) of the senior grades. How many trees are planted in fifth grade?
学校各年级共植树240棵，高年级植了其中的(2/3)，五年级植树的棵数是高年级的(1/2)．五年级植树多少棵？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">240 * (2/3) * (1/2)</gadget>
<output>80</output>

<result>80</result>