Adam pays $35.50 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 4 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 = 35.50
7 u = 35.50 - 2.60
7 u = 32.90
1 u = 32.90 ÷ 7 = 4.70
Cost of 1 marble
= 4.70 + 2.60
= $7.30
(b)
Cost of 6 marbles and 4 stickers
= 6 x 7.30 + 4 x 4.70
= 43.80 + 18.80
= $62.60
Answer(s): (a) $7.30; (b) $62.60