Guangming Primary School divided 140 students in the fifth grade into three groups for tree planting activities. It is known that the ratio of the first group to the second group is 2:3, the ratio of the second group to the third group is 4:5, and How many more people are there in the third group than in the first group?
光明小学将五年级的140名学生，分成三个小组进行植树活动，已知第一小组和第二小组人数的比是2：3，第二小组和第三小组人数比是4：5，第三小组比第一小组多多少人？
<gadget id="calculator">8 + 12 + 15</gadget>
<output>35</output>

<gadget id="calculator">140 / 35</gadget>
<output>4</output>

<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<gadget id="calculator">4 * 7</gadget>
<output>28</output>

<result>28</result>