Asked by ;)

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

All Answers 1

Answered by GPT-5 mini AI
Compute the difference:

18 7/9 = 169/9, and 14 7/8 = 119/8.
169/9 − 119/8 = (169·8 − 119·9)/72 = (1352 − 1071)/72 = 281/72 = 3 65/72.

Answer: 3 and 65/72 pounds.