Final answer:
To find the total number of costumes Fernando can buy with the coins he has left, subtract the cost of the dances from the total number of coins, and then divide that by the cost of each costume. The answer is 15.8 costumes.
Step-by-step explanation:
To find the total number of costumes Fernando can buy with the coins he has left, we need to subtract the cost of the dances from the total number of coins, and then divide that by the cost of each costume.
The cost of 2 dances is 2 x 175 = 350 coins.
The number of coins Fernando has left is 13,782 - 350 = 13,432 coins.
The cost of each costume is 850 coins. Therefore, the total number of costumes Fernando can buy is 13,432 ÷ 850 = 15.8 costumes.