Adam pays $26.20 for 1 marble and 8 stickers.
The marble costs $1.90 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 8 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 + 1.90
Cost of 8 stickers
= 8 x 1 u
= 8 u
Total cost of 1 marble and 8 stickers
= 1 u + 1.90 + 8 u
= 9 u + 1.90
9 u + 1.90 = 26.20
9 u = 26.20 - 1.90
9 u = 24.30
1 u = 24.30 ÷ 9 = 2.70
Cost of 1 marble
= 2.70 + 1.90
= $4.60
(b)
Cost of 8 marbles and 4 stickers
= 8 x 4.60 + 4 x 2.70
= 36.80 + 10.80
= $47.60
Answer(s): (a) $4.60; (b) $47.60