The answer is 8 because you use the order of operations. So it would be 16 divided by 4, then you would do 4+4 which is 8
Check the attached file for the solution.
The number could be any multiple of nine that ends in 4 or 9, like 9, 54, 99, 144, etc.
The primes are 2, 3, 5, 7, 11, 13, 17, 19. There are 8 of them, so they make up 40% of the numbers 1–20.
Answer: 300
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