SOLUTION: I do not understand how to turn these in to linear equations? I can't figure out what to put where for an equation that will give me the answer I need. How much 90 percent vineg

Question 344495: I do not understand how to turn these in to linear equations? I can't figure out what to put where for an equation that will give me the answer I need.
How much 90 percent vinegar do you have to add to a gallon of 5 percent vinegar to get 20 percent vinegar?
________ gallons.
and
You can paint a certain room in 9 hours. Your brother can do it in 8 hours. How long does it take the two of you working together?
_____ hours.
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
How much 90 percent vinegar do you have to add to a gallon of 5 percent vinegar to get 20 percent vinegar?
You have 1 gallon of 5%
You need to add x gallons of 90%
The result will be (x+1) gallons of 20%

gallons of 90%
gallons
Make sense?

You can paint a certain room in 9 hours. Your brother can do it in 8 hours. How long does it take the two of you working together?
He can do you cna do 1/9 of the job in an hour. He can d0 1/8
Together you can do of the job in an hour

hours
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