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All of the members of our spray-painting team paint at the same speed. If 20 team members can paint a 4800 square foot wall in 36 minutes, then how many minutes would it take for 9 team members to paint a 3600 square foot wall?

Feb 9, 2020

#1
+4
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so write like this:

20 people -> 4800 @36min

9 people   -> 3600

now we have to find efficiency of each person

20*36min*efficiency = 4800

efficiency = 6.66667

therefore, 9 people * 6.6667 * time = 3600

time = 60 minutes

Easy peazy

Feb 9, 2020
#2
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Hi there...

Personally, if I posted an answer to this I would do the calculation based in "seconds"  first and then finish it off by dividing by 60 to get "minutes", but it would yield the same results.

Kind regards

BizzyX

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BizzyX  Feb 9, 2020
#3
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60 minutes?!!!!

Feb 9, 2020
#4
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20 team members paint a 4800 square wall in 36 minutes.

How fast can one team member paint?

20 * 36 = 720 minutes

One team member can paint a 4800 square wall in 720 minutes.

How fast can one team member paint a square wall of 3600 square feet?

720 * (3600/4800) = 540 minutes

Now how fast would it take 9 team members?

540 / 9 = 60 minutes.

Which matches KIson!

Feb 9, 2020