Question

Twice a number plus 4 is 8

Answer 1

Let's take the number as 'x'

Twice : 2x

Plus 4 : 2x + 4

This is equal to 8.

... 2x + 4 = 8

Subtracting 4 on both sides :

... 2x = 4

Dividing by 2 on both sides :

... x = 4 / 2

... x = 2

Hence, the number is 2.

Hope this helps!

Answer 2

To do this, we must allow this hidden number to be x.
2x + 4 = 8
Now we will solve by first subtracting 4 from each side:
2x = 4
Now we will divide each side by 2 to isolate the variable:
x = 2
Therefore, the mystery number is 2.