Adam spends $9 for 1 sticker and 1 marble.
The cost of 1 sticker is
12 the cost of 1 marble.
- How much is the marble?
- How much is the sticker less than the marble?
(a)
Cost of the sticker = 1 u
Cost of the marble = 2 u
Total cost of the sticker and the marble
= 1 u + 2 u
= 3 u
3 u = 9
1 u = 9 ÷ 3 = 3
Cost of the marble
= 2 u
= 2 x 3
= $6
(b)
Cost of the sticker less than the marble
= 2 u - 1 u
= 1 u
= 1 x 3
= $3
Answer(s): (a) $6; (b) $3