"decreased by" means "minus" 12 decreased by z means 12 - z It really is that simple.
You have to assign some variable to "some number", for example "x". Then your expression becomes 12 / x.You have to assign some variable to "some number", for example "x". Then your expression becomes 12 / x.You have to assign some variable to "some number", for example "x". Then your expression becomes 12 / x.You have to assign some variable to "some number", for example "x". Then your expression becomes 12 / x.
12
Let the unknown number be x and so the expression is: x+12
16
That depends on what the number is which you are decreasing by. It is a number less than or equal to 12. Beyond that nothing more can be said without further information.
It is: 12 ≤ N - 7
16
x + 12. If the unknown number is represented by x, the expression for a number increased by 12 would be x + 12.
12/x
n × 12
-(n/12)