SOLUTION: Please help me solve this problem!: Mrs. Smith balances the company books in 5 hours. it takes her assistant 7 hours to do the same job. If they work together, find how long it tak
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Question 1079605: Please help me solve this problem!: Mrs. Smith balances the company books in 5 hours. it takes her assistant 7 hours to do the same job. If they work together, find how long it takes them to balance the books. Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! in 1 hour, Mrs. does 1/5 and her assistant 1/7 of the books.
x hours to do the whole thing.
x/5 + x/7=1
multiply everything by 35
7x+5x=35
12x=35
x=35/12
=2 11/12 hours
