Question

LIBRARY BOOK SALEPaperback Books $5Hardcover Books $9Magazines $21. The library is having a used book sale. How much do 4 hardcover books cost? Draw a number line to show the answer.2. How much more would Chico spend if he bought 3 hardcover books rather than 3 paperback books? Show how you found the answer.3. Maggie bought only magazines. The clerk told her she owed $15. How does Maggie know the clerk made a mistake?

Answer 1

Write out the given parameters

Paperback Books $5

Hardcover Books $9

Magazines $2

`\begin{gathered} \text{ The cost of 1 Hardcover books =\$9} \\ 4\text{ hardcover books will be } \\ 4*9\text{ = \$36} \end{gathered}`

Hence

1) The cost of 4 hardcover books is $36

To show the result on a number line we have the diagram below

2). 3 hardcover will costs

`3*9=27`

3 paperback books will cost

`5\text{ }*3=15`

If Chico bought 3 hardcover rather than 3 paperback books

chico will spend

`27-15=12`

Hence, Chico will spend $12 more