Final answer:
The discount on each skin was calculated by subtracting the total amount paid from the original total for three skins and dividing the result by three. The price of each skin was reduced by $8.
Step-by-step explanation:
Joseph is looking to find out how much the price of each skin was reduced. To calculate this, we need to figure out the total discount he received on the three skins and then divide that amount by three.
The original price for three skins would be 3 times $87, which equals $261. Since Joseph paid $237, we subtract the amount paid from the original total to find out the discount on the three skins: $261 - $237 = $24.
Now, we divide the total discount by the number of skins to find the discount per skin, which is $24 ÷ 3 = $8. Hence, the price of each skin was reduced by $8.