SOLUTION: how many gallons of a 3% salt solution must be mixed with 50 gallons of a 7% solution to obtain 5% solution? please help me out? Thanks

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Question 404830: how many gallons of a 3% salt solution must be mixed
with 50 gallons of a 7% solution to obtain 5% solution?


please help me out? Thanks
Found 2 solutions by ankor@dixie-net.com, zaibi:
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
how many gallons of a 3% salt solution must be mixed with 50 gallons of a 7% solution to obtain 5% solution?
:
Let x = amt of 3% solution required
:
.03x + .07(50) = .05(x+50)
:
.03x + 3.5 = .05x + 2.5
:
3.5 - 2.5 = .05x - .03x
:
1 = .02x
x = 1%2F.02
x = 50 gal of 3% required, to mix with 50 gal of 7% solution
:

Answer by zaibi(4) About Me  (Show Source):
You can put this solution on YOUR website!
3%x+7%50=5%y -----1
x+50=y -----------2
=> x=50 gallons
and y=100 gallons