3个旅客同住某旅馆的一个房间．每人拿出10美元共30美元作为预付房租交给了收款人．后来收款人发觉这个房间的房租应是25美元，就叫来旅馆的侍者，交给他5张1美元的钞票，让他退给3个旅客．侍者在半路上起了贪心，把2美元装进了自己的腰包，退给旅客每人1美元．现在让我们回过 3 travelers live in a room in a hotel. Each person took out $10 for a total of $30 as prepaid rent to the payee. Later, the payee found that the rent in this room should be $25. He called the hotel’s waiter and handed him five one-dollar bills to return him to three passengers. The waiter made a greedy halfway, loaded $2 into his pockets and returned the passengers $1 each. Let’s go back now