What are 3 odd numbers whose sum is 20?

There are none. If you add an even number to a number, the status doesn't change. If you add an odd number to a number, the status changes. If you add an even amount of odd numbers to a number, the status doesn't change. read more

If you add an even number to a number, the status doesn’t change. If you add an odd number to a number, the status changes. If you add an even amount of odd numbers to a number, the status doesn’t change. read more

You can of course try all combinations of odd numbers from 1 to 27, or make a simple parity argument: the sum of two odd numbers is always even, the sum of an even number and an odd number is always odd. 30 is even. read more