7.03+1.672+20
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There are 69 odd numbers between 20 and 158.
There are 40 odd numbers between 20 and 100. Remember that an odd number is every second number. There are 80 numbers between 20 and 100, so there are 40 odd numbers and 40 even numbers.
First odd number greater than 20 is 21 Last odd number less than 200 is 199 → number of odd numbers between 20 and 200 is (199 - 21) ÷ 2 + 1 = 90
15 and 9 are both odd, composite numbers less than 20.
It goes: 703/19 = 37 times