Final answer:
Dana can cook a maximum of 45 meals using her savings, and the cost of eating each meal at a restaurant is $40. Therefore, the family can eat a maximum of 1 meal at a restaurant.
Step-by-step explanation:
Dana saved $450 for food for her upcoming vacation. The breakfast was included with their hotel, but lunch and dinner are not. When Dana cooks lunch or dinner it costs on average $10. When the family goes to a restaurant for lunch or dinner it costs on average $40. To determine the maximum number of meals the family could eat at a restaurant, we need to calculate the amount of money Dana would have left after cooking all the meals and compare it to the cost of eating meals at a restaurant.
Based on the given information, Dana can cook 45 meals ($450 / $10) on average. The cost of eating each meal at a restaurant is $40, so Dana would have to subtract $400 (45 meals x $40) from her savings. The remaining amount would be $50.
Therefore, the family can eat a maximum of 1 meal at a restaurant ($50 / $40). Therefore, the correct answer is A) 5 meals.