Adam pays $25.10 for 1 marble and 5 stickers.
The marble costs $1.70 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 5 marbles and 4 stickers?
(a)
Choose the cheaper item to be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 marble = 1 u + 1.70
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 1.70 + 5 u
= 6 u + 1.70
6 u + 1.70 = 25.10
6 u = 25.10 - 1.70
6 u = 23.40
1 u = 23.40 ÷ 6 = 3.90
Cost of 1 marble
= 3.90 + 1.70
= $5.60
(b)
Cost of 5 marbles and 4 stickers
= 5 x 5.60 + 4 x 3.90
= 28.00 + 15.60
= $43.60
Answer(s): (a) $5.60; (b) $43.60