Adam pays $35.60 for 1 marble and 8 stickers.
The marble costs $1.40 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 8 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 + 1.40
Cost of 8 stickers
= 8 x 1 u
= 8 u
Total cost of 1 marble and 8 stickers
= 1 u + 1.40 + 8 u
= 9 u + 1.40
9 u + 1.40 = 35.60
9 u = 35.60 - 1.40
9 u = 34.20
1 u = 34.20 ÷ 9 = 3.80
Cost of 1 marble
= 3.80 + 1.40
= $5.20
(b)
Cost of 8 marbles and 6 stickers
= 8 x 5.20 + 6 x 3.80
= 41.60 + 22.80
= $64.40
Answer(s): (a) $5.20; (b) $64.40