Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapters 1-4 - Decimals - Test - Page 328: 31


Estimate: $6\div3$=2 Dollars per pound Exact: 2.29 Dollars per pound

Work Step by Step

2.7 pounds of apple for 6.18 dollars Cost per pound = $6.18\div2.7$ Let's find Estimate: 6.18 Rounds to 6 2.7 Rounds to 3 $6\div3$=2 Dollars Exact: $6.18\div2.7$ = $\frac{618}{100}\div\frac{27}{10}$ = $\frac{618}{100}\times\frac{10}{27}$ (divisions of fractions is the multiplication by the reciprocal of the second fraction) = $\frac{206}{10}\times\frac{1}{9}$ = $\frac{206}{90}$ = 2.288.. $\approx$ 2.29 dollars
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