The sum of 3 and a number, equaling 5, (if you want to know what the number is...) is 2
3+2=5
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That would be an addition problem such as 2+3=5 5 would be the sum.
3(x+5)
(x + 5) + 3
A number ending in 0 or 5, whose digits sum to a multiple of 3.
If the sum of the digits of the number is a multiple of 3 then that number is divisible by 3. For example: 156351 The sum of the digits is 1+5+6+3+5+1 = 21 which is divisble by 3 156351/3 = 52117