Question

I'm thinking of a number. If I multiply it by 4 and then add 8, the answer is 20.What is the number?

Answer 1

The number is 3

Explanations:

Let the number you are thinking of be "p"

If you multiply the number by 4, we will have 4p.

If the result is added to 8, the expression will become 4p + 8

If the result of the expression is 20, then;

`4p+8=20`

Subtract 8 from both sides

`\begin{gathered} 4p+8-8=20-8 \\ 4p=12 \end{gathered}`

Divide both sides by 4

`\begin{gathered} (4p)/(4)=(12)/(4) \\ p=3 \end{gathered}`

Therefore the number you are thinking of is 3

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