Adam spends $10 for 1 sticker and 1 marble.
The cost of 1 sticker is
19 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 = 9 u
Total cost of the sticker and the marble
= 1 u + 9 u
= 10 u
10 u = 10
1 u = 10 ÷ 10 = 1
Cost of the marble
= 9 u
= 9 x 1
= $9
(b)
Cost of the sticker less than the marble
= 9 u - 1 u
= 8 u
= 8 x 1
= $8
Answer(s): (a) $9; (b) $8