To celebrate New Year's Day, the fourth grade students will make 600 flowers to decorate the classroom. If only students from class 4 and 1 are allowed to do it, each person should make 15 flowers; if only students from class 4 and 2 are allowed to do it, each person should make 20 flowers; if only students from class 4 and 3 should do it, each person should make 12 flowers. If students in three classes do it together, how many flowers do each person make on average?
庆元旦，四年级同学们要做600朵花来布置教室．如果只让四1班同学做，每人要做15朵；如果只让四2班同学做，每人要做20朵；如果只让四3班同学做，每人要做12朵．如果三个班的同学一起做，平均每人做几朵？
<gadget id="calculator">600 / 15</gadget>
<output>40</output>

<gadget id="calculator">600 / 20</gadget>
<output>30</output>

<gadget id="calculator">600 / 12</gadget>
<output>50</output>

<gadget id="calculator">40 + 30 + 50</gadget>
<output>120</output>

<gadget id="calculator">600 / 120</gadget>
<output>5</output>

<result>5</result>