Let's take the LCM of 4 and 3: it's 12. So, since 12 is 3 times 4, we divide (inverse proportions) by 2. So it will take 2 hours for 12 people. Now, we see that we divide by 4 to get to 3. Therefore, we multiply by 4 and get 8.
Is that correct?
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to paint one house requires 4 people x 6 hours = 24 people hours to paint the house
if you have only three people it will take 8 hours (to get 24 people hours)