Question 10
In each cross-shaped figure the corner numbers (top-left, top-right, bottom-left, bottom-right) and the centre number are: 4, 7, 4, 8 with 4 in the centre; 7, 6, 9, 2 with 40 in the centre; 6, 3, 9, 4 with ? in the centre. What number should replace the question mark? Answer with a natural number.
