9. A certain business printer can print 40 characters per second, which is 4 times as fast as an average printer. If an average printer can print 5 times as fast as an electric typewriter, how many characters per minute can an electric typewriter print?
(A) 2
(B) 32
(C) 50
(D) 120
(E) 600
Answer: D
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Solution:
ReplyDeleteLet the speed of electric typewrite be x
Then speed of average printer will be 5x
Then speed of business printer will be 20 x
i.e. 20 x = 40
x = 2 characters per second. i.e. 120 characters per minute.