Question
Alan drives an average of 100 miles each week. His car can travel an average of 25 miles per gallon of gasoline. Alan would like to reduce his weekly expenditure on gasoline by $5. Assuming gasoline costs $4 per gallon, which equation can Alan use to determine how many fewer average miles, m, he should drive each week?
The correct answer is:
Solution:-The correct option is D.
Cost of 1-gallon gasoline = $4.
And 1 gallon gasoline covers 25 miles.
m = The number of fewer average miles that he should drive each week.
So, 25 miles can be covered in $4.
1 mile can be covered in $(4/25).
Therefore, m miles can be covered in $(
)
He wants to save $5 each week. So we equate the amount of money saved.
This means
To calculate average miles, divide the total distance traveled by the time spent traveling. This will provides us with your average speed.
So, for example, if Ben traveled 150 miles in 3 hours, 120 miles in 2 hours, and 70 miles in an hour, his average speed was about 57 miles per hour. In this case, Alan can travel a hundred miles per week at 25 miles per gallon of gasoline to save $5 per week on gas, assuming gasoline costs $4 per gallon.
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