SOLUTION: I have 80% solution (vinegar) and need 7% solution (Vinegar). How much water do I have to add to get the result?

Question 584698: I have 80% solution (vinegar) and need 7% solution (Vinegar).
How much water do I have to add to get the result?
Found 2 solutions by richwmiller, amalm06:
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
Depends how much you have (x) or how much you want to have (x+y).
.80x=.07(x+y)
or from standpoint of water
.20x+1.0y=.93(x+y)
Answer by amalm06(224) (Show Source): You can put this solution on YOUR website!
(0.80)(x)+0=(0.7)(x+w), where x is the amount of vinegar and w is the quantity of water
0.8x=0.7x+0.7w
0.1x=0.7w
w=(7/10)x (Answer)
RELATED QUESTIONS
You have 10 cups of a cleaning solution that is 10% white vinegar and 90% water. You want (answered by josgarithmetic,ikleyn,MathTherapy)
I have 20% solution acetic acid [vinegar] and want to dilute it to 5% solution - how much (answered by ankor@dixie-net.com)
How much 90 percent vinegar do you have to add to a gallon of 5 percent vinegar to get... (answered by stanbon)
I need help with this problem. A previous tutor replied with vinegar + vinegar=Vinegar.... (answered by stanbon)
I have 5percent by volume vinegar. How much water do I have to boil off to get 20 percent (answered by josgarithmetic)
hey, I would like to use 5% vinegar instead of 10%. How much 5% vinegar I need, if the... (answered by ewatrrr)
I do not understand how to turn these in to linear equations? I can't figure out what to... (answered by vleith)
How much water should be evaporated from 100 liters of 40% vinegar solution to increase... (answered by Fombitz)
I have a 35% solution and need a 3% solution. How much water do i add to obtain a 3%... (answered by stanbon)