Exercise 19 Page 15

A rate is a special type of ratio that compares quantities with different kinds of units. A unit rate is a rate that has been reduced to have a denominator of 1 unit. We are given the following rate. 144milesin 4.5gallons Let's write this rate as a fraction. 144miles/4.5gallons To find the unit rate, we need to write an equivalent rate with a denominator of 1 gallon. Let's ignore the units for simplicity.

144/4.5

ReduceFrac

a/b=.a / 4.5./.b / 4.5.

144/ 4.5/4.5/ 4.5

UseCalc

Use a calculator

32/4.5/4.5

QuotOne

a/a=1

32/1

Finally, we got the unit rate. 144miles/4.5gallons = 32miles/1gallon The unit rate is 32 miles per gallon.