Rich and Brent - Your explanation made this problem very easy to solve. I noticed where I got the problem wrong. First, I tried to figure out the total odd numbers between 10 and 1000 = 495. At this point, i just got stuck. I didn't know where else to go. I understand your method perfectly. Thank you!

Here is my Analysis: In an effort to reduce the number of fires started by cigarettes, a major tobacco company is test-marketing a cigarette in which thin layers of extra paper are used to decrease the amount of oxygen entering the cigarette, thereby slowing the rate at which it burns and lowering t...