Last week’s answer: 15. The first team will need to play the other five once. The second team will only need to play four more, as they will have already played the first team. The third team plays three, the fourth plays two and the fifth and sixth teams have the last game. Thus the total number of games = 5 + 4 + 3 + 2 + 1 = 15.
This week’s problem: There are 25 tomatoes in a crate. 80% of them are red and the rest are yellow. How many yellow tomatoes are there in the crate?
The answer will be in next week’s weekly problem.