The only arithmetic mean of 7 and 25 is (7+25)/2 =16. If you really mean all arithmetic means of all possible pairs of numbers between 7 and 25, then there are so many pairs you should clearly state so in your question. Or better still, just write them down, work them out and add them up, which is what I would have to do.
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16
Factors of 25: 1, 5, 25 Their sum = 31 Difference between 31 and 8 = 23.
The sum of all integers between 1 and 25 is equal to (25 x (25 - 1))/2 = 325.
There is a formula to calculate this sum. It is, S = ½n(n + 1) In this question, n = 25 so the sum of the numbers from 1-25 is, ½ x 25 x 26 = 325
Two, whose digital sum is 5.