Concept explainers
a.
To calculate: The approximate number of gallons of gasoline used on the trip.
a.

Answer to Problem 39E
The approximate number of gallons of gasoline used on the trip is
Explanation of Solution
Given:
Two full tanks of gasoline are used on the trip.
A tank holds
Calculation:
To calculate the total gallons of gasoline used the trip, find the total gallons of gasoline in the two tanks used in the trip. Since each tank holds
To find the number of gallons of gasoline in the two tanks, multiply the numerator and denominator by
Hence there are
Therefore,
b.
To calculate: Approximate number of miles driven on the trip.
b.

Answer to Problem 39E
The approximate number of miles driven on the trip is
Explanation of Solution
Given:
The car drives about
Calculation:
To calculate the number of miles driven on the trip, find the number of miles the car can drive in the amount of gasoline it has. As calculated in subpart a,
To find the number of miles the car can drive in
Hence, the car can drive
Therefore, the number of miles driven in the trip
c.
To calculate: The money spent per mile on gasoline.
c.

Answer to Problem 39E
The cost of gasoline per mile is
Explanation of Solution
Given:
The car drives about
The cost of gasoline is
Calculation:
To calculate the money spent per mile on gasoline, equivalent rate is used. As given, for
Multiply this by cost per gallon(
Convert this into unit rate.
Therefore, the cost of gasoline per mile is
d.
To calculate: Whether there is enough money to spend on gasoline for another trip.
d.

Answer to Problem 39E
There isn’t enough money to spend on gasoline for another trip.
Explanation of Solution
Given:
There are
The trip is
The amount spent per mile on gasoline is same as the first trip.
Calculation:
To determine whether there is enough money to spend on gasoline for another trip, calculate the amount of money required for the gasoline to be used for the given distance. As calculated is subpart c, the cost of gasoline per mile is
To calculate the cost of gasoline for
Therefore,
Since money to be spent is only
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