Adam pays $36.60 for 1 marble and 4 stickers.
The marble costs $1.10 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 4 marbles and 3 stickers?
(a)
Choose the cheaper item to be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 marble = 1 u + 1.10
Cost of 4 stickers
= 4 x 1 u
= 4 u
Total cost of 1 marble and 4 stickers
= 1 u + 1.10 + 4 u
= 5 u + 1.10
5 u + 1.10 = 36.60
5 u = 36.60 - 1.10
5 u = 35.50
1 u = 35.50 ÷ 5 = 7.10
Cost of 1 marble
= 7.10 + 1.10
= $8.20
(b)
Cost of 4 marbles and 3 stickers
= 4 x 8.20 + 3 x 7.10
= 32.80 + 21.30
= $54.10
Answer(s): (a) $8.20; (b) $54.10