The marker cost four times as much as the notebook. Carl bought 1 marker and 2 notebooks for $18.
- How much did one notebook cost?
- How much did one marker cost?
(a)
Cost of the notebook = 1 u
Cost of 2 notebooks = 2 x 1 u = 2 u
Cost of the marker = 4 x 1 u = 4 u
Total cost = 2 u + 4 u = 6 u
6 u = 18
1 u = 18 ÷ 6 = 3
Cost of 1 notebook
= 1 u
= $3
(b)
Cost of 1 marker
= 4 u
= 4 x 3
= $12
Answer(s): (a) $3; (b)$12