What number should replace the question mark? The wheel has eight outer circles (clockwise from the top: 6, 5, 13, 10, 8, 3, 2, ?) and eight inner sectors (clockwise from the top right: 12, 6, 4, 9, 6, 14, 7, 5). Answer with a natural number.
Grid rows: 38 18 1 27 21 2 / 9 16 26 7 6 58 / 28 20 3 10 32 50 / 15 24 11 5 36 30 / 19 8 17 52 13 4 / 12 22 42 14 44 64. Which number is two places away from itself plus 2, three places away from itself multiplied by 2, four places away from itself divided by 2, and three places away from itself less 2? (Places are counted in a straight line, including diagonals.) Answer with a natural number.
Four explorers must cross a rope bridge at night. The bridge holds only two people at a time and there is one torch, which must be carried by whoever crosses (including on any return trip). They take 2, 3, 5 and 10 minutes to cross, and a pair moves at the slower pace. What is the least number of minutes for all four to reach the other side? Answer with a natural number.
The letters A to H are placed evenly around a circle in clockwise order, with A at the top. What letter is two letters anticlockwise away from the letter immediately opposite the letter three letters clockwise from the letter F? Answer with a single capital letter (English alphabet A-Z).
What number should replace the question mark? There are three large squares, each made of four numbers: 15, 27, 35, 23; 32, 19, 18, 31; and 12, 47, ?, 26. Answer with a natural number.