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How about: 120+1.2 = 121.2
31 & 67
9 and 36
When you add two or more prime numbers you will only end up with a whole number and not a decimal number.
Add all of the numbers up, and then divide that result by how many numbers there were, e.g. 1,2,3,4,5. Added up they make 15. As there are five numbers there, you divide 15 by 5, and you get 3. Voila.