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Math·Algebra·Linear equations in two variables

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A landscaping company mixes oil with gasoline to power its tools. A chainsaw requires 8 ounces of oil per gallon of gasoline. A lawnmower requires 4 ounces of oil per gallon of gasoline. The company uses a total of 21 ounces of oil in its mixes for the chainsaw and lawnmower. Which of the following equations represents this situation, where $x$ represents the amount of gasoline, in gallons, in the mix for the chainsaw and $y$ represents the amount of gasoline, in gallons, in the mix for the lawnmower?

A

$2(x+2y)=21$

B

$2(2x+y)=21$

C

$4(x+2y)=21$

D

$4(2x+y)=21$