Question

You had $21 to spend on five notebooks after buying them u had $6 dollars how much did each notebook cost.

Answer 1

Let x be the cost of each notebook. We know that we bought 5 of them, then the total cost of the notebooks is:

`5x`

We had 21 dollars and we spent 5x on the notebooks, this can be express as:

`21-5x`

Finally we know that this is equal to the six dollars we had at the end, then we have the equations:

`21-5x=6`

Solving for x we have:

`\begin{gathered} 21-5x=6 \\ 21-6=5x \\ 5x=15 \\ x=(15)/(5) \\ x=3 \end{gathered}`

Therefore each notebook cost $3