Lizzy: Lynne bought 7 books about cats and 2 books about the solar system. She also bought 3 magazines. Each book cost 7$ and each magazine cost $4. How much did Lynne spend in all?.
Me: Hmmm, let me think. I think this is the detailed solution:
Lynne bought a total of 7 + 2 = 9 books. The books cost Lynne 9 x 7 = $63. For 3 magazines, Lynne spent 3 x 4 = $12. In total, Lynne spent 63 + 12 = 75$. Final answer: 75.