The notebook cost four times as much as the pen. Daniel bought 1 notebook and 5 pens for $18.
- How much did one pen cost?
- How much did one notebook cost?
(a)
Cost of the pen = 1 u
Cost of 5 pens = 5 x 1 u = 5 u
Cost of the notebook = 4 x 1 u = 4 u
Total cost = 5 u + 4 u = 9 u
9 u = 18
1 u = 18 ÷ 9 = 2
Cost of 1 pen
= 1 u
= $2
(b)
Cost of 1 notebook
= 4 u
= 4 x 2
= $8
Answer(s): (a) $2; (b)$8