SOLUTION: There are two wells at a farm. Grandma comes to collect water from the left well every 24 days, while Grandpa comes to collect water from the right well every 18 days. Today they b

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Question 985544: There are two wells at a farm. Grandma comes to collect water from the left well every 24 days, while Grandpa comes to collect water from the right well every 18 days. Today they both come to collect water from the wells. How many days will have passed when they both come to collect water at the same time again?
A. 6
B. 36
C. 48
D. 72
E. 432
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
It is the least common denominator problem. Start with the greater number and keep increasing it seeing if the lesser number divides into it. At 72, you have 3*24 and 4*18. The answer is D.