Adam pays $34.10 for 1 marble and 4 stickers.
The marble costs $2.60 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 + 2.60
Cost of 4 stickers
= 4 x 1 u
= 4 u
Total cost of 1 marble and 4 stickers
= 1 u + 2.60 + 4 u
= 5 u + 2.60
5 u + 2.60 = 34.10
5 u = 34.10 - 2.60
5 u = 31.50
1 u = 31.50 ÷ 5 = 6.30
Cost of 1 marble
= 6.30 + 2.60
= $8.90
(b)
Cost of 4 marbles and 2 stickers
= 4 x 8.90 + 2 x 6.30
= 35.60 + 12.60
= $48.20
Answer(s): (a) $8.90; (b) $48.20