Brain Teasers and Puzzles

A box for your workings out:

Hint: The number is less than 20.

Answer: 8.

We need a number such that:

2 x Number = 14 + 1 x Number
                  -
                  4

Multiply throughout by 4 to give:

8 x Number = 56 + Number

So:

7 x Number = 56

So Number = 8.