The first 5 multiples of 17 are: 17, 34, 51, 68, and 85.
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The first five two-digit prime numbers are 11, 13, 17, 19, and 23.
17, 34, 51, 68, 85
The first five prime numbers are 2, 3, 5, 7, and 11. I don't know what you mean by "of 28".
The sum is: 11+13+17+19+23 = 83
You can do this in your head by thinking, "how many times does 20 fit into 100?" The answer to that question is five. This means that you can multiply 17 by five in order to get the percentage represented by 17/20. 17 times five equals 85, so that is your answer. 17/20 ≡ 85%