I assume by "uneven" numbers you mean "odd" numbers (like 1, 3, 15, ...)
The sum of 2 odd numbers or 2 even numbers is an even number
The sum of one even and one odd number is odd
Using O for any odd number and E for any even number, the above becomes:
O + O = E
E + E = E
E + O = O
O + E = O
Using this, adding together 4 odd numbers gives:
(O + O) + (O + O) = E + E = E
Thus adding together 4 odd numbers will result in an even number. 15 is an odd number, thus no 4 odd numbers can add together to make 15.
two prime numbers when added together will equal 63: 2 + 61
2 odd numbers added together equal an event number. to even numbers added together equal an even number. it is impossible to make 4 odd numbers equal an even.
The numbers are -10 and -70
The numbers are 55.5 and 44.5
32 + 32
3595 and 1, when added together, and 3575 and 20 when added together
Two (or four) digits added together cannot equal 42. Two-digit numbers multiplied together cannot equal 82.
-8 and -8