Adam pays $44.90 for 1 marble and 4 stickers.
The marble costs $2.40 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 4 marbles and 5 stickers?
(a)
Choose the cheaper item to be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 marble = 1 u + 2.40
Cost of 4 stickers
= 4 x 1 u
= 4 u
Total cost of 1 marble and 4 stickers
= 1 u + 2.40 + 4 u
= 5 u + 2.40
5 u + 2.40 = 44.90
5 u = 44.90 - 2.40
5 u = 42.50
1 u = 42.50 ÷ 5 = 8.50
Cost of 1 marble
= 8.50 + 2.40
= $10.90
(b)
Cost of 4 marbles and 5 stickers
= 4 x 10.90 + 5 x 8.50
= 43.60 + 42.50
= $86.10
Answer(s): (a) $10.90; (b) $86.10