In the grid below (rows: 43 6 16 12 24 / 2 22 1 4 9 / 46 30 48 5 13 / 38 8 36 7 3 / 11 20 14 10 15), what number is three places away from itself less two, two places away from itself divided by two, three places away from itself less five, and three places away from itself multiplied by three? (Places are counted in straight lines: along rows, columns or diagonals.) Answer with a natural number.
To which of the squares below can a dot be added so that the dot then meets the same conditions as the dot in the square above? Choose from the options labelled in the figure.
What number should replace the question mark? Two blocks of numbers, each with three columns, are: (7 6 5 / 4 9 2 / 1 3 7 / 3 8 4 / 5 4 2) and (7 6 3 / 8 1 9 / 3 2 7 / 9 9 5 / 3 2 ?). Answer with a natural number.
When the net above is folded to form a cube, which is the only one of the following that can be produced? Choose from the options labelled in the figure.
Switch A turns lights 1 and 2 on/off or off/on; B turns lights 2 and 4; C turns lights 1 and 3; D turns lights 3 and 4. Black = ON, white = OFF. Switches A, C, D and B are thrown in turn and Figure 1 turns into Figure 2. Which switch does not work at all?
Three coins are tossed in the air and two of the coins land with heads face upwards. What are the chances, as a percentage, that on the next toss of the three coins at least two of the coins will land with heads face upwards again? Answer with a natural number.