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
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
To find the numbers that add up to 66, we can start by listing pairs of numbers that sum to 66. Some possible pairs include 1 and 65, 2 and 64, 3 and 63, and so on. Additionally, we can use algebra to represent this problem as an equation, where x + y = 66. By solving this equation, we can find various combinations of numbers that add up to 66, such as 10 and 56, 20 and 46, or 33 and 33.
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