Question

Tim had $20.00 to spend on 6 pens. After buying them, he had $8.00. How much did each pen cost?

Answer 1

Money Tim had Is $20
After buying the pens Tim has $8
Tim bought 6 pens
To find out how much he spent on each pen = 12/6
So Tim spent $2 a piece on his pens

(Why too much for 6 Pens)

Answer 2

If Tim had $20 to spend on 6 pens, and after buying them he had $8 left, that means that he spent 20 - 8 = $12 dollars on those 6 pens.
This means that to calculate the price of one pen, you just need to divide the money he spent ($12) by the number of pens he bought (6), and that is 12/6 = 2. Each pen cost him $2.