if you include both 20 and 35, 16
if you don't include 20 and 35, 14
if you only include one of the numbers but not the other, 15
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Twenty of them
Between 52 and 73 there are 53, 54, ..., 72 a total of 72 - 53 + 1 = 20 numbers. Including 52 and 73 there are 22 numbers.
The two consecutive whole numbers that 20 lies between are 19 and 21. This can be determined by recognizing that 20 is the average of 19 and 21. In other words, (19 + 21) / 2 = 20. This demonstrates that 20 is exactly halfway between 19 and 21 in the number line.
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.