How many three-digit positive integers are odd and do not contain the number 5?

First of all, there are 900 three-digit numbers from 100 to 999, half of which are odd and half are even, so the odd number is 450.

Among them, 500 digits account for 1/9, and 50 digits are a * * *, leaving 400 after being removed.

Among the remaining figures, ten digits are 5, accounting for110, and one * * * is 40, leaving 360 after being removed.

Among the remaining numbers, the number with five digits accounts for 1/5, and the number with a * * * is 72, leaving 288 after being removed.

So there are 288 such three digits to satisfy the meaning of the question.

There are 288 positive integers with three digits.

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