97
50
30
There are 136 odd number between 1 and 275.
25
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.
There are 101 numbers between 0 and 100. Because it starts with an even number and ends with an even number, there is 1 less odd number than even. So 51 even and 50 odd.
97
50
5 is an odd number and is a factor of 100
25
50
50
50
450
30
289