Math Problem Statement

You are running a fuel economy study. One of the cars you find is blue. It can travel 45 1/2 miles on 1/4 gallons of gasoline. Another car is red. It can travel 22 2/5 miles on 4/5 gallon of gasoline. What is the unit rate for miles per gallon for each car? Which car could travel the greater distance on 1 gallon of gasoline?

Solution

Let's break down the problem based on the image:

  1. The blue car travels 451245 \frac{1}{2} miles on 14\frac{1}{4} gallons of gasoline.
  2. The red car travels 222522 \frac{2}{5} miles on 45\frac{4}{5} gallons of gasoline.

Step 1: Convert mixed fractions to improper fractions

  • For the blue car: 4512=912 miles45 \frac{1}{2} = \frac{91}{2} \text{ miles}
  • For the red car: 2225=1125 miles22 \frac{2}{5} = \frac{112}{5} \text{ miles}

Step 2: Calculate the unit rate (miles per gallon) for each car

The unit rate is calculated as the number of miles traveled per gallon of gasoline.

Blue car:

Unit rate=912 miles14 gallons=912×41=3642=182 miles per gallon\text{Unit rate} = \frac{\frac{91}{2} \text{ miles}}{\frac{1}{4} \text{ gallons}} = \frac{91}{2} \times \frac{4}{1} = \frac{364}{2} = 182 \text{ miles per gallon}

Red car:

Unit rate=1125 miles45 gallons=1125×54=1124=28 miles per gallon\text{Unit rate} = \frac{\frac{112}{5} \text{ miles}}{\frac{4}{5} \text{ gallons}} = \frac{112}{5} \times \frac{5}{4} = \frac{112}{4} = 28 \text{ miles per gallon}

Step 3: Compare the unit rates

  • The blue car can travel 182 miles per gallon.
  • The red car can travel 28 miles per gallon.

Therefore, the blue car can travel a greater distance on 1 gallon of gasoline.

Would you like further details on any part of this solution? Here are some related questions:

  1. What is the difference in distance each car can travel with 1 gallon of gas?
  2. How do mixed numbers get converted into improper fractions?
  3. Can we calculate how much gasoline the blue car would need to travel 1 mile?
  4. Why does the blue car have a much higher fuel efficiency than the red car?
  5. How do these calculations relate to real-world fuel economy measurements?

Tip: When converting mixed numbers to improper fractions, remember to multiply the whole number by the denominator, then add the numerator.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Fractions
Ratios
Unit Rate

Formulas

Unit rate = Total distance / Total fuel used

Theorems

None (basic arithmetic)

Suitable Grade Level

Grades 5-7