x + (x+1) + (x+2) + (x+3) = 4x + 6 = 66
4x = 60
x = 15
so answer is 15,16,17,18
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If the range is three, then there are four whole numbers involved. The average value of these numbers is 66/4 = 16.5. Because the numbers are consecutive - evenly distributed - 16.5 is actually 'in the middle' of the four. From which we can infer that the numbers in question are 15,16,17 and 18.
21, 22 & 23 15, 16, 17 & 18
The numbers are -18, -17, -16 and -15.
The numbers are 21, 22 and 23.