Find all pairs of consecutive odd natural numbers both of which are larger than 10 and their sum is less than 40.

Find all pairs of consecutive odd positive integers both of which are smaller than 10 such that their sum is more than 11.

Find all pairs of consecutive even positive intetegers, both of which are larger than 5 such that their sum is less than 23.

Find the pairs of consecutive odd positive intergers both of which are smaller than 10 such that their sum is more than 11.

What is the sum of first n odd natural numbers ?

Find the consecutive natural numbers whose product is 20.

Find the sum of all odd integers less than 450.