During the Old Man’s Day, 240 students in the school gave gifts to their grandparents, among whom (1/3) gave flowers, and those who gave greeting cards were equivalent to (1/2) who gave flowers. How many students send greeting cards?
老人节期间，学校有240名学生给爷爷奶奶送礼物，其中(1/3)的同学送鲜花，送贺卡的同学相当于送鲜花的(1/2)．送贺卡的同学有多少人？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">240 * (1/3) * (1/2)</gadget>
<output>40</output>

<result>40</result>