Louise is in a toy store. She already has 28 toys worth $10 each in her cart. On her way to the till she adds 20 teddy bears to the cart. If the $580 in Louise's wallet is exactly enough to pay for all the toys, how much does each teddy bear cost? Let's answer step by step:
Initially, Louise's cart has toys worth 10 * 28 = 280 dollars. If Louise pays for the toys originally in her cart, her wallet will remain with 580 - 280 = 300 dollars. Dividing the remaining amount by the number of teddy bears gives 300 / 20 = 15 dollars. The answer: 15.