Peter is buying a set of glasses. They cost $3 for small glasses and $5 for large ones. He has $50. If he buys 8 small ones and leaves with $1 in change, how many large ones did he buy? Think carefully first, then make a decision:
He spent $49 on glasses because 50 - 49 = 1. He spent $24 on small glasses because 8x3 = 24. He spent $25 on large glasses because 49 - 24 = 25. He bought 5 large glasses because 25 / 5 = 5. So, the answer is 5.