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meerkat18
To answer the question, use the concept of ratio and proportion. Haley's given mileage should be equal all throughout. Let x be the minimum number of gallons that Haley needs, the proportion becomes,
                                18 miles / 1 gallon = 200 miles / x gallons
The value of x is 11.11 gallons. Thus, Haley need at least 11.11 gallons. 
calculista

Answer:

[tex]11\ gallons[/tex]

Step-by-step explanation:

we know that

Haley's car gets at least [tex]18[/tex] miles per gallon

so

by proportion

Find the minimum number of gallons she'll need for a trip that is [tex]200[/tex] miles

[tex]\frac{1}{18}\frac{gallon}{miles} =\frac{x}{200}\frac{gallon}{miles}\\ \\x=200/18\\ \\x= 11.11\ gallons[/tex]

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