Hello!
To find how much the computer printer can print word documents per second, we divide the given values, 900 word documents by 12 seconds.
900 word documents / 12 seconds = 75 word documents/second
With that, we can divide 1200 word documents by the 75 word documents/second to find how many seconds are required to print a 1200 word document.
1200 word documents / 75 word documents/seconds = 16 seconds
Therefore, it will take 16 seconds for a computer printer to print a 1200 word document.
