Question

Twice a number plus four equals 22 .what is the number ?

Answer 1

Let's call x to the unknown number.

"Twice a number" means we need to multiply the unknown number by 2, that is, 2x.

Then, "twice a number plus four equals 22" is represented by the next equation:

`2x+4=22`

Subtracting 4 at both sides of the equation:

`\begin{gathered} 2x+4-4=22-4 \\ 2x=18 \end{gathered}`

Dividing by 2 at both sides of the equation:

`\begin{gathered} (2x)/(2)=(18)/(2) \\ x=9 \end{gathered}`

The number is 9