Basic College Mathematics (9th Edition)

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

Chapter 2 - Multiplying and Dividing Fractions - 2.1 Basics of Fractions - 2.1 Exercises: 15

Answer

2 or greater: $\frac{5}{6}$ 4 or less: $\frac{4}{6}$, or $\frac{2}{3}$ 9 years: $\frac{2}{6}$, or $\frac{1}{3}$

Work Step by Step

There are 6 bills total. 5 out of the 6 have a lifespan of 2 years or greater (5, 10, 20, 50, and 100). This is represented by the fraction $\frac{5}{6}$. 4 of the 6 have a lifespan of 4 years or less (1, 5, 10, and 20). This is represented by the fraction $\frac{4}{6}$, which can be simplified to $\frac{2}{3}$. 2 of the 6 have a lifespan of 9 years (50 and 100). This is represented by the fraction $\frac{2}{6}$, which simplifies to $\frac{1}{3}$.
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