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The average of 12, 6 & 24 = (12+6+24)/3 = 42/3 = 14.
The average of 6, 15 and m is (6 + 15 + m) / 3 = (21 + m)/3 = 7 + m/3
15 plus -3 equals 12 12 divided by -6 equals -2
3, 6, 9, 12, 15
15: (15, 1) (5, 3) 12: (12, 1) (6, 2) (4, 3)