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All of the members of our spray-painting team paint at the same speed. If $5$ team members can paint a certain wall in $27$ minutes, then how many minutes would it take $15$ of our team members to paint the same wall?

 Oct 28, 2021
 #1
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It would take 5*15/27 = 25/9 minutes.

 Oct 28, 2021
 #2
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An increase of 15 / 5 ==3x in manpower will entail a decrease in time by the same factor:

 

That is: 27 minutes / 3==9 minutes.

 

OR:

 

[5  x  27] / 15 ==9 minutes.

 Oct 29, 2021

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