SOLUTION: A chainsaw runs on fuel that is 10% oil and 90% gas. How much oil will have to be added to 3 gallons of fuel that is 5% oil and 95% gas in order to use the chainsaw?

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Question 139119: A chainsaw runs on fuel that is 10% oil and 90% gas. How much oil will have to be added to 3 gallons of fuel that is 5% oil and 95% gas in order to use the chainsaw?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
let x="gal. of oil" __ x(100%)+3(5%)=(3+x)(10%) __ dividing by 5% __ 20x+3=(3+x)2

20x+3=6+2x __ 18x=3 __ x=1/6