Problema Solution
Suppose that the distance a car travels varies directly with the amount of gasoline it uses. A certain car uses
17
gallons of gasoline to travel
544
miles. If the car travels
480
miles, how much gasoline does it need?
Answer provided by our tutors
The statement "y varies directly as x" means that when x increases, y increases by the same factor.
This means that y and x always have the same ratio.
Let 'x' represent the gasoline needed to travel 480 miles.
544 : 17 = 480 : x
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click here to see the equation solved for x
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x = 15 gal
15 gallons are needed to travel 480 miles.