Final answer:
To find out the number of lawn seats still available, divide the total number of seats sold in Sections A and B by 2. Then subtract this quantity from the total number of seats in the arena. Lawn seats still available = 5,000.
Step-by-step explanation:
To find out how many lawn seats are still available, we need to know the total number of seats in Sections A and B. Since the number of seats sold in these sections is the same, we can divide the total number of seats sold on the first day (10,000) by 2 to get the number of seats in each section. So, in each section, there were 5,000 seats sold.
Now, if the total number of seats in the available arena is 15,000, we can subtract the number of seats sold in Sections A and B from this total to find out how many lawn seats are still available.
Total number of seats sold in Sections A and B = 2 * 5,000 = 10,000
Lawn seats still available = Total number of seats in the arena - Total number of seats sold in Sections A and B = 15,000 - 10,000 = 5,000