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?
1 3 and StartFraction 11 over 72 EndFraction pounds
2 3 and StartFraction 65 over 72 EndFraction pounds
3 4 and StartFraction 11 over 72 EndFraction pounds
4 4 and StartFraction 65 over 72 EndFraction pounds
