Question

Haley's car gets at least 18 miles per gallon. She is planning a trip that is 200 miles.

What is the minimum number of gallons she'll need?
11
12
13

Answer 1

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.

Answer 2

`11\ gallons`

Explanation:

we know that

Haley's car gets at least
`18` miles per gallon

so

by proportion

Find the minimum number of gallons she'll need for a trip that is
`200` miles

`(1)/(18)(gallon)/(miles) =(x)/(200)(gallon)/(miles)\\ \\x=200/18\\ \\x= 11.11\ gallons`