The marker cost thrice as much as the pencil. Lee bought 1 marker and 2 pencils for $20.
- How much did one pencil cost?
- How much did one marker cost?
(a)
Cost of the pencil = 1 u
Cost of 2 pencils = 2 x 1 u = 2 u
Cost of the marker = 3 x 1 u = 3 u
Total cost = 2 u + 3 u = 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Cost of 1 pencil
= 1 u
= $4
(b)
Cost of 1 marker
= 3 u
= 3 x 4
= $12
Answer(s): (a) $4; (b)$12