Adam pays $16.10 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 2 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 = 16.10
5 u = 16.10 - 1.60
5 u = 14.50
1 u = 14.50 ÷ 5 = 2.90
Cost of 1 marble
= 2.90 + 1.60
= $4.50
(b)
Cost of 4 marbles and 2 stickers
= 4 x 4.50 + 2 x 2.90
= 18.00 + 5.80
= $23.80
Answer(s): (a) $4.50; (b) $23.80