What number should replace the question mark? Three crosses each have a centre number and outer numbers (top, left, right, bottom): centre 6 with 9, 5, 6, 8; centre 8 with 8, 2, 1, 3; and centre ? with 6, 4, 5, 7. Answer with a natural number.
What number should replace the question mark? Three circles each have a centre number and outer numbers: centre 5 with 3, 8, 2, 7; centre 6 with 6, 4, 7, 5, 8; centre ? with 9, 7, 8, 7, 9, 8. Answer with a natural number.
In eight years time the combined age of me and my two sons will be 124. What will the combined age be in five years time? Answer with a natural number.
Multiply the lowest even number in the grid by the highest odd number. The grid is: 14, 26, 28; 91, 18, 89; 57, 177, 22; 189, 16, 7. Answer with a natural number.
What number should replace the question mark? Circles hold 12, 5 and 16; squares hold 8, ? and 19; triangles hold 18, 11 and 4. Answer with a natural number.
To which hexagon below can a dot be added so that both dots then meet the same conditions as the two dots in the hexagon above? Choose from the options labelled in the figure.
Three teams, from England, Scotland and Wales, are competing for two trophies, one for golf and one for tennis. How many different outcomes of the two competitions exist? 6, 8, 9 or 12?
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 B, D, A and C are thrown in turn and Figure 1 turns into Figure 2. Which switch does not work at all?
What number should replace the question mark? The numbers form a block-shaped grid: 5 7 4 3 1 / 1 2 2 6 5 / 6 6 5 ? / 1 2. Answer with a natural number.
