Math Destroyer T14 #36

[Wererew]

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I need help setting up the right ratio/ equation for this question!

So far I tried:
12workers/5days=1house
1house/12workers=5days
5 days/12 workers=1house

5days/12workers=1house, multiply 12workers to get 60days/1worker... but wouldn't that equal 12 houses

Not sure what to do.. thanks in advance!

 

[Pearl E. White]

So we know 1 house/5 days,12 workers. This is equivalent to 1 house/60 days,1 worker. So, what value would give us 1 house/4 days,x workers? 60=4x. x=15. So, it would take 15 workers to complete the house in 4 days. The questions asks how many additional workers. 15-12=3 workers. Let me know if you need more help!