1) find all pairs of consecutive odd positive integers,both of which are smaller than 18,such that their sum is more than 20.
in this why you took x+ 2 not only x please tell me
let the one number of the pair of positive odd numbers be x therefore other consecutive odd number is (x+2).
both the numbers are smaller than 18.
sum of two numbers is more than 20.
since x is an odd number.
thus the pair of odd numbers are (11,13) , (13,15) , (15,17)
hope this helps you.