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Odium
You divide 63 by 3 to get 21 photos in 3 minutes, then multiply by 7 to get 147 photos in 21 minutes.

Hope this helped :)

CuteCookie33
To find the rate of how many photos the scanner scans in a minute, we would have to divide 63/9 which equals 7.
So the scanner scans 7 photos in one minute.

Now to find out how many photos the scanner scans in 21 minutes, we would have to multiply 21x7, which equals 147.

The scanner can scan 147 photos in 21 minutes.