Adam pays $41.80 for 1 marble and 6 stickers.
The marble costs $2.60 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 6 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 + 2.60
Cost of 6 stickers
= 6 x 1 u
= 6 u
Total cost of 1 marble and 6 stickers
= 1 u + 2.60 + 6 u
= 7 u + 2.60
7 u + 2.60 = 41.80
7 u = 41.80 - 2.60
7 u = 39.20
1 u = 39.20 ÷ 7 = 5.60
Cost of 1 marble
= 5.60 + 2.60
= $8.20
(b)
Cost of 6 marbles and 2 stickers
= 6 x 8.20 + 2 x 5.60
= 49.20 + 11.20
= $60.40
Answer(s): (a) $8.20; (b) $60.40