Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 2 - Multiplying and Dividing Fractions - Review Exercises - Page 191: 80


$\displaystyle \frac{203}{3}=67\frac{2}{3}$ quarts

Work Step by Step

We know that we need to use $7\frac{1}{4}$ quarts of additive for each tank of fuel. Therefore, if we have $9\frac{1}{3}$ tanks, the amount of additive must be the product of these two numbers. First, we estimate the result by rounding to the nearest whole number: $Additive\approx 7*9=63$ quarts Now, we get the precise answer: $Additive=\displaystyle 7\frac{1}{4}*9\frac{1}{3}=\frac{29}{4}*\frac{28}{3}=\frac{29*28}{3*4}=\frac{29*7}{3}=\frac{203}{3}=67\frac{2}{3}$ quarts
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