51
-13
Add up all the numbers and divide that total by the number of numbers. 1+ 2 + 3 + 4 + 5 = 15 15/5 = 3 The average is 3
27
The two numbers that add up to 7 and multiply to 15 are 3 and 5. This is because 3 + 5 = 8 and 3 * 5 = 15. These two numbers satisfy both conditions simultaneously, making them the correct solution to the problem.
15
45
51
The numbers are: 12 and -15
They all relate by adding up the 6+6+3=15 You can not get to the sum of 15 is you don't have the first 3 numbers to add up.
-13
There is no answer to this. The factors of 15 are 1, 3, 5 and 15. The only numbers that add up to four are 1+3, 4+0 and 2+2.
Add up all the numbers and divide that total by the number of numbers. 1+ 2 + 3 + 4 + 5 = 15 15/5 = 3 The average is 3
-15
Well, darling, the numbers you're looking for are 3 and 5. They multiply to 15 and add up to 8, not 4. Looks like you need to check your math before coming to me with these brain teasers.
1+2+3+4+5
Add all of the numbers up, and then divide that result by how many numbers there were, e.g. 1,2,3,4,5. Added up they make 15. As there are five numbers there, you divide 15 by 5, and you get 3. Voila.