odd + odd = even
even + odd = odd (commutativity yields the vice verca possible too)
even + even = even
Thus, we know that the group of numbers have at least 1 odd. However, since 2 odds make an even, any amount of even amount of odds make an even. Therefore, there must be an odd number of odds (i.e., {1, 3, 5}, the only ones that exist in that set).
QED.
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135100 and 35000, which, if added together, makes 170100.
1, 2, 3, 4 , 5
Just multiply the first five prime numbers! 2x3x5x7x11 = 6x35x11 = 210x11 = 2310. Any multiple of this number "has the first five prime numbers as factors", but 2310 is the smallest such number.
The average of a group of numbers is equal to the sum of the numbers divided by the number of numbers. If you want to find the sum of the five numbers, just multiply 790.6 by 5 to get the sum, which is 3953
The number is 15