Broken Clock

An old wall clock falls on the ground and breaks into 3 pieces. Describe the pieces, if you know that the sum of the numbers on each of them is the same.


The total of all numbers on the clock is 1 + 2 + ... + 12 = 78. Therefore each piece must contain numbers with total sum 26. The only way for this to happen is if the pieces are broken via 3 parallel lines - {1, 2, 11, 12}, {3, 4, 9, 10}, {5, 6, 7, 8}.