What number should replace the question mark? A circle is divided into eight segments. Going clockwise from the top left they contain 3, 7, 6, 8, ?, 5, 6, 4. Answer with a natural number.
What number should replace the question mark? Each group has top numbers, bottom numbers and a result: top 16, 3 and bottom 3, 4 gives 72; top 17, 8 and bottom 2, 1 gives 160; top 14, 8 and bottom 4, 3 gives ?. Answer with a natural number.
Each line and symbol in the four outer circles is transferred to the centre circle by the rules: appearing once, it is transferred; twice, it is possibly transferred; three times, it is transferred; four times, it is not transferred. Which circle A to E should be at the centre? Choose from the options labelled in the figure.
The bath plug is out and both taps are full on. The hot tap alone fills the bath in 3 minutes, the cold tap alone in 2 minutes, and the water empties through the plug hole in 6 minutes. In how many seconds will the bath be filled? Answer with a natural number.
What letter should replace the question mark? Rows: 3, D, 22; 12, M, 13; 15, ?, 10. Use the English alphabet A=1 to Z=26. Answer with a single capital letter (English alphabet A-Z).
What number should replace the question mark? Each group has two top numbers, two bottom numbers and a result: top 8, 7 and bottom 11, 2 gives 72; top 9, 6 and bottom 12, 3 gives 54; top 10, 9 and bottom 2, 2 gives ?. Answer with a natural number.