Question

A number is decreased by seven. Then, the new number is multiplied by 3 to get an answer of -9.

What is the original number?

-30
30
4
-4

Answer 1

its 4

Answer 2

Let the number be x
(x-7)*3 = -9
This implies that, 3x - 21 = -9
Thus, 3x = 12
So, x = 4.

Answer 3

let the original number be "x"
(x-7)*3 = -9
so, expand the bracket using Bodmas (bidmas) = Brackets , Other (indices), division, Multiplication, addition and subtraction. Do this in order starting with brackets, then, other, then multiplication and so on...
3x - 21 = -9
so,
3x = 12
x = 12/3
therefore, "x = 4"