Sum and difference problem
------------------------------------------
We are given both the sum and difference of two unknown numbers.
If
S=sum of the two numbers = 6.1
D=difference of the two numbers (larger minus the smaller) = 1.6
Then
larger number = (S+D)/2 = (6.1+1.6)/2 = 7.7/2 = 3.85
smaller number= (S-D)/2 = (6.1-1.6)/2 = 4.5/2 = 2.25
