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The number halfway between 25 and 45 is the average of the two numbers. To find the average, you add the two numbers together and then divide by 2. In this case Read more Math and Arithmetic +1 What numbers is a composite 3 or 5 or 7 or 9 or 11 or 13 or 15 ? Asked by Wiki User In the list provided, the numbers 9 and 15 are composite numbers. A composite number is a positive integer greater than 1 that can be formed by multiplying two Read more Factoring and Multiples +1 What are the factors and prime factors of 39916800 ? Asked by Wiki User Oh, dude, you’re hitting me with the (...)