In a game of 12 players lasting 65 minutes, three reserves alternate equally with each player, so that all players, including the reserves, are on the pitch for the same length of time. For how many minutes is each person on the pitch? Answer with a natural number.
What number should replace the question mark? Three 2 x 2 squares, each listed as top row then bottom row: 3, 9 / 6, 8; 5, 5 / 4, 6; 7, 1 / 2, ? Answer with a natural number.
What number should replace the question mark? Three triangles each have a top digit, a middle number and two bottom digits: top 2, middle 16, bottom 5 and 6; top 2, middle 17, bottom 8 and 9; top 3, middle ?, bottom 6 and 1. Answer with a natural number.
What number should replace the question mark? The left circle has top 2 and bottom numbers 3, 6; the middle circle has top ? and bottom numbers 8, 8; the right circle has top 1 and bottom numbers 5, 2. Answer with a natural number.