45 people from Class 51 participated in the interest group, 1.5 times the number of participants from Class 52. How many people in the two classes participated in the interest group?
五1班有45人参加了兴趣小组，是五2班参加人数的1.5倍．两个班一共有多少人参加了兴趣小组？
<gadget id="calculator">45 / 1.5</gadget>
<output>30</output>

<gadget id="calculator">30 + 45</gadget>
<output>75</output>

<result>75</result>