There are many combinations of 2 numbers that sum to 70. Any combination of numbers where the first number is x and the second number is 70-x will sum to 70.
For example:
69 and 1
68 and 2
67 and 3
66 and 4...
29 & 41
There are five ways to get a sum of 70 with two prime numbers: 3 + 67 = 70 11 + 59 = 70 17 + 53 = 70 23 + 47 = 70 29 + 41 = 70.
the 2 numbers are 51 and 19
70 + 19 = 89 or: the sum of 70 and 19 is 89
If the sum of the original seven numbers is 2814, and they're all increased by 70, the new total will be 2814+490=3304
29 & 41
There are five ways to get a sum of 70 with two prime numbers: 3 + 67 = 70 11 + 59 = 70 17 + 53 = 70 23 + 47 = 70 29 + 41 = 70.
the 2 numbers are 51 and 19
The two numbers are 10 and 2
70 + 19 = 89 or: the sum of 70 and 19 is 89
-20
If the sum of the original seven numbers is 2814, and they're all increased by 70, the new total will be 2814+490=3304
Since there are 2 numbers in the group, the group average is 1/2 of their sum.
There cannot be any such set of numbers. The sum of any five odd numbers must be odd and so cannot be 70.
The sum of the first 70 consecutive odd numbers is 4,900.
The numbers are 69, 70, and 71.
4900