Double the mean.
e.g. 7 and 8 7+8=15
15/2=7.5
mean of 7 and 8=7.5
Alternatively you could just add 1/2 and multiply by two. ( it is the same method just worded slightly simpler.
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7 8
The numbers are 54 and 56.
5+2+1=8 and 8 is not divisible by 3.
The numbers are 22 and 24.
The sum of two numbers is a whole number if both of the numbers are whole numbers, or if the sum of two fractions can be simplified to a whole number.