Adam pays $36.10 for 1 marble and 4 stickers.
The marble costs $1.60 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 4 marbles and 6 stickers?
(a)
Choose the cheaper item to be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 marble = 1 u + 1.60
Cost of 4 stickers
= 4 x 1 u
= 4 u
Total cost of 1 marble and 4 stickers
= 1 u + 1.60 + 4 u
= 5 u + 1.60
5 u + 1.60 = 36.10
5 u = 36.10 - 1.60
5 u = 34.50
1 u = 34.50 ÷ 5 = 6.90
Cost of 1 marble
= 6.90 + 1.60
= $8.50
(b)
Cost of 4 marbles and 6 stickers
= 4 x 8.50 + 6 x 6.90
= 34.00 + 41.40
= $75.40
Answer(s): (a) $8.50; (b) $75.40