It's a challenging puzzle my friend passed to me. Can anyone help me out there?
To solve this question you need to use decimals. You can't make an answer just by adding any of those 3 whole numbers as they all are odd numbers. So by using decimals you can overcome the above said problem.
And the answer is
13.573 + 9.3111 + 7.1159 = 30
Note: No numbers used outside from the List
source: youtube