4, 22
6, 20
8, 18
10, 16
12, 14
The sum of each pair is 26 and both the numbers in a given pair are composite numbers.
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The answer to the question is: 5
51
There are infinitely many pairs of numbers that will add to 105.8 and infinitely many pairs of numbers that will multiply to 105.8 but there are no pair that will add AND multiply. I do not think there are larger sets, but I could be wrong. One example of a triplet adding and multiplying to the same number is 1, 2 and 3. They add to 6 and multiply to 6.
20
The three pairs of numbers that each add up to 7 are (1, 6), (2, 5), and (3, 4). In each pair, when you add the two numbers together, the result is 7. These pairs are examples of complementary numbers that combine to equal a specific sum, in this case, 7.
There are infinitely many pairs. 1) Pick a value for one of the numbers - call this A 2) The second number, B = 0.47 - A
51
41,2
Not necessarily. For example 15 and 16 are composite numbers. They add to 31, which is a prime number. Similarly, the composite numbers 20 and 21 add up to 41, which is a prime number.
19,3 17,5 11,11
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There are infinitely many pairs of numbers that will add to 105.8 and infinitely many pairs of numbers that will multiply to 105.8 but there are no pair that will add AND multiply. I do not think there are larger sets, but I could be wrong. One example of a triplet adding and multiplying to the same number is 1, 2 and 3. They add to 6 and multiply to 6.
As long as 2 is not one of the primes that you are adding, then I can guarantee that you will get a composite. 2 is the only even prime number. Any time you add two odd numbers together, you will get an even number (which is not prime). So if you add them in pairs, you will have three even numbers, which added together result in an even number, so it is composite. If you throw in 2 as one of the primes that you're adding, then your result is odd, and I don't know what else to say about your result.
No, they are not. You can add two composite numbers, 15 and 14 for example, and get a sum, 29, that is prime.
They are two composite numbers and they add up to 56 which is also a composite number
There are many pairs: 3 and 317 or 7 and 313
227
composite