Adam pays $23.60 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 6 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 = 23.60
5 u = 23.60 - 1.10
5 u = 22.50
1 u = 22.50 ÷ 5 = 4.50
Cost of 1 marble
= 4.50 + 1.10
= $5.60
(b)
Cost of 4 marbles and 6 stickers
= 4 x 5.60 + 6 x 4.50
= 22.40 + 27.00
= $49.40
Answer(s): (a) $5.60; (b) $49.40