SOLUTION: I'd have a question; how do I find out how many odd 2 digit numbers are greater than 30?

Question 209310: I'd have a question; how do I find out how many odd 2 digit numbers are greater than 30?
Found 2 solutions by RAY100, MathTherapy:
Answer by RAY100(1637) (Show Source):
You can put this solution on YOUR website!
The 1st odd 2 digit number >30 is,,,,,,31
.
The last odd 2 digit number (less than 100) is,,,,99
.
99-31=68 total number gaps,,,,,divided by 2(odd & even) = 34 number gaps
.
since we are counting 1st and last, add 1 to gap = 35 total numbers
.
checking, 31,33,35,37, 39,,,,,makes 5 numbers for the 30's
.
This repeats for the 40's, 50's, 60's, 70's, 80's,and 90's,,,or 7 times
.
5*7=35 total numbers,,,,ok
.

Answer by MathTherapy(639) (Show Source):
You can put this solution on YOUR website!

I'd have a question; how do I find out how many odd 2 digit numbers are greater than 30?

The number of integers in a series of consecutive even or odd integers is calculated as:

Since the largest integer in the series of 2-digit odd integers between 30 and 100 is 99, and since the smallest is 31, we have:

------> ------> , or
Therefore, the amount of odd integers greater than 30 is