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Exercises Numbers, fractions and percents

Example 5.65 from Prealgebra, 5.6 Ratios and Rate

Ratios and Rate: example 5.65

Sven drives his car $455$ miles, using $14$ gallons of gasoline. How many miles per gallon does his car get?

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Solution
Start with a rate of miles to gallons. Then divide.

$455 miles to 14 gallons of gas$

Write as a rate. $\frac{455 miles}{14 gallons}$

Divide 455 by 14 to get the unit rate. $\frac{32.5 miles}{1 gallon}$

Sven’s car gets $32.5$ miles/gallon, or $32.5$ mpg.

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

Find the unit rate: $423$ miles to $18$ gallons of gas.

How did it go?

PreviousRatios and Rate: example 5.64 Next Ratios and Rate: example 5.66

From Prealgebra (1st edition) by OpenStax (Rice University), section 5.6, licensed under CC BY 4.0. Original at openstax.org. We split the solution into steps; the words, numbers and figures are the book's. OpenStax doesn't endorse this site.