SOLUTION: How many gallons of a 10% salt solution must be mixed with a 50 gallons of a 50% salt solution to obtain a 20% salt solution?

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Question 447409: How many gallons of a 10% salt solution must be mixed with a 50 gallons of a 50% salt solution to obtain a 20% salt solution?
Answer by rwm(914) About Me  (Show Source):
You can put this solution on YOUR website!
.1x+50*.5=.2*(x+50)
x/10+25=2x/10+10
15=x/10
150=x