The numbers are -6, -5 and -4.
15, 16 and 17
13, 14, 15
The integers are -6, -5 and -4 OR -7, -5 and -3 using only consecutive odd integers.
18
3 consecutive even integers whose sum is 396 are 130, 132 and 134.
Divide the sum of the three consecutive odd integers by 3: 45/3 = 15. The smallest of these integers will be two less than 15 and the largest will be two more than 15, so the three consecutive odd integers will be 13, 15, and 17.
15, 16 and 17
13, 14, 15
18
The integers are -6, -5 and -4 OR -7, -5 and -3 using only consecutive odd integers.
18
It need not be. 2 and 3 are consecutive integers and their sum is 5, not 31.
Divide the sum of the three consecutive odd integers by 3: 51 / 3 = 17. The smallest of these integers will be two less than 17 and the largest will be two more than 17, so the three consecutive odd integers will be 15, 17, and 19.
15
The numbers are -5, -4, -3, -2 and -1.
The only proper factor of 51 that is less than 1/3 of 51 is 3. Divide the sum of three consecutive odd integers by 3: 51/3 = 17. The smallest of these integers will be two less than 17 and the largest will be two more than 17, so the three consecutive odd integers having a sum of 51 are 15, 17, and 19.
Divide the sum of the three consecutive odd integers by 3: -3 /3 = -1. The smallest of these integers will be two less than -1 and the largest will be two more than -1, so the three consecutive odd integers will be -3, -1, and +1.