Adam pays $37.60 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 2 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 = 37.60
5 u = 37.60 - 1.10
5 u = 36.50
1 u = 36.50 ÷ 5 = 7.30
Cost of 1 marble
= 7.30 + 1.10
= $8.40
(b)
Cost of 4 marbles and 2 stickers
= 4 x 8.40 + 2 x 7.30
= 33.60 + 14.60
= $48.20
Answer(s): (a) $8.40; (b) $48.20