Twelve is the product of three and a number.
Product: an answer given due to multiplication.
Since Twelve is described as the product of three and a number, it is our answer.
?? = 12
Twelve is the product of three and a number. since it is a product, that means their was multiplication involved. using the clues "Three and a number", we can deduce that these are multiplied to get our product, which is twelve.
if it says number, then that represents the unknown variable of the equation. this is usually defined as X or any other letter(s) if their is more than one variable or if it is specified.
3X = 12