Question: In a restaurant, the chef prepared 17 meals to sell for lunch. During lunch, he sold 12 meals. After lunch, the chef prepared another 5 meals for dinner. How many meals does the chef have for dinner, assuming he can use the remaining lunch meals as well?
Solution:
The chef had 17 - 12 = 5 meals left after lunch.
So, the chef has 5 + 5 = 10 meals for dinner.
Answer: 10