A, B, and C can each complete a project in 20, 30, or 60 days. How many days would it take A to complete the task if he is aided by B and C every third day?
A. 12 days
B. 15 days
C. 16 days
D. 18 days
Answer:B
A, B, and C can each complete a project in 20, 30, or 60 days. How many days would it take A to complete the task if he is aided by B and C every third day?
A. 12 days B. 15 days C. 16 days D. 18 days
Explanation: A's two-day work Equals 1/20 x 2 /10 = 1.1 day's work for (A + B + C) = 1/20 + 1/30 + 1/60 = 6/60 = 1/10.Work completed in three days = 1/10 + 1/10 = 1/5.Now, 1/5 of the job is completed in 3 days.The entire project will take 3 x 5 = 15 days to complete.