Question

Eliza’s backpack weighs 18 and StartFraction 7 over 9 EndFraction pounds with her math book in it. Without her math book, her backpack weighs 14 and StartFraction 7 over 8 EndFraction pounds. How much does Eliza’s math book weigh?

3 and StartFraction 11 over 72 EndFraction pounds
3 and StartFraction 65 over 72 EndFraction pounds
4 and StartFraction 11 over 72 EndFraction pounds
4 and StartFraction 65 over 72 EndFraction pounds

Answer 1

B. 3 and StartFraction 65 over 72 EndFraction pounds

Explanation:

Answer 2

2nd option:
`3 (65)/(72)` pounds

Explanation:

backpack +math book -----
`18 (7)/(9)` pounds

backpack -----
`14 (7)/(8)` pounds

Weight of math book

= (weight of backpack +math book) -(weight of math book)

`= 18 (7)/(9) - 14 (7)/(8) \\ = <strong>3 (65)/(72)</strong>`