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Math·Algebra·Linear equations in one variable

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$0.10x+0.20y=0.17(x+y)$ The equation gives a volume, in gallons, of a $10\%$ saltwater solution that could be mixed with a volume $y$, in gallons, of a $20\%$ saltwater solution to produce a $17\%$ saltwater solution. According to this equation, what volume, in gallons, of the $20\%$ saltwater solution could be mixed with $90.0$ gallons of the $10\%$ saltwater solution to produce a $17\%$ saltwater solution?

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