The ratio of the number of people cleaning the classroom to cleaning the sanitation area was 5:3. Later, 18 people were selected from among the classroom cleaners to clean the sanitation area. This is because the ratio of their number was 2:3. How many people clean up in total?
打扫教室的人数与打扫卫生区的比是5：3，后来从扫教室人中抽调18人扫卫生区，这是他们人数的比是2：3．一共有多少人打扫卫生？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/8) - (2/5)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">18 / (9/40)</gadget>
<output>80</output>

<result>80</result>