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Question 450701: Hi, can you help me understand this!
"Tim can build 3 shelves in one day and Al can build 4 shelves in 2 days. If Al starts work one day before Tim, how long will they work together to build 22 shelves?"
Thank you very much for your time!
Found 2 solutions by Edwin McCravy, josmiceli:
Answer by Edwin McCravy(20060)   (Show Source):
You can put this solution on YOUR website! Hi, can you help me understand this!
"Tim can build 3 shelves in one day and Al can build 4 shelves in 2 days. If Al starts work one day before Tim, how long will they work together to build 22 shelves?"
Thank you very much for your time!
Al can build 4 shelves in 2 days,
so Al can build 2 shelves in 1 day.
Tim can build 3 shelves in 1 day,
So Al and Tim together can build
2+3 or 5 shelves in 1 day.
Since Al can build 2 shelves in 1 day,
then in the first day when he works alone,
he will build 2 shelves. That leaves
22-2 = 20 shelves left to build.
They will build the remaining 20 shelves
working together.
Since Al and Tim together can build
5 shelves in 1 day, and since 20÷5 = 4,
it will take then 4 days to build the remaining
20 shelves.
Edwin
Answer by josmiceli(19441)  (Show Source):
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