It takes 60 identical printing machines 2 hours to print 300 cards. How much more time would it take 50 of these machines to print the same total? Choices
A) 20 min
B) 25 min
C) 26 min
D) 36 min
E) 30 min

Rationale: 50 % of 60 = 30 % or 0.30 2 hr x 60 min = 120 min 120 min x 0.30 = 36 min it will take 36 min longer to print them with only 50 printers . answer is d
Answer: D