In the list 73695287653196482, multiply the number of even digits that are immediately followed by an odd digit by the number of odd digits that are immediately followed by an even digit. Answer with a natural number.
Which number is two places away from itself plus three, one place away from itself plus five, three places away from itself less one, two places away from itself plus two and three places away from itself less four? Places are counted in a straight line (horizontal, vertical or diagonal) in this grid: row 1: 45 16 9 11 15 32; row 2: 21 61 28 27 12 1; row 3: 65 8 55 19 7 56; row 4: 24 13 2 25 14 5; row 5: 62 67 30 10 29 59; row 6: 3 6 17 12 4 18. Answer with a natural number.
Find the weight to balance the scales. From the pivot, the 4 kg weight is 3 units to the left, the 16 kg weight is 1 unit to the left, the 10 kg weight is 2 units to the right and the unknown weight is 4 units to the right. Answer with a natural number.
When the net shown is folded to form a cube, which is the only one of the options that can be produced? Choose from the options labelled in the figure.
What number should replace the question mark? The seven segments of the heptagon, going clockwise from the top, contain 16, 1, 19, 7, ?, 12 and 22. Answer with a natural number.
Sally has half as many again as Sue, who has half as many again as Sam. Together they have 152. How many does Sally have? Answer with a natural number.
How many revolutions must the largest cog make in order to bring the cogs back to their original positions? The cogs have 11, 8, 5 and 4 teeth. Answer with a natural number.