5.(11.07 MC) It takes a total of 3 hours to wash every window on a building. There are 30 windows. How many minutes does it take to wash just one window?(​

6 minutes

Explanation:

Since the answer most certainly would be some number of MINUTES, I changed "3 hours" to minutes.  (60 min. in an hour x 3 hrs. = 180 minutes.)

Then, set up the equation:

 180   min.                           x    min.

              =    

30  windows                       1    window

30x   =   180

    x   =     6

OR you could have simply thought that 30 windows in 3 hours means the same as 10 windows in 1 hour.  (30 divided by 3).

Then, that means 10 windows in 60 minutes, which is, 6 minutes.                        (60 divided by 10.)

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explanation:

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