Adam pays $35.10 for 1 marble and 6 stickers.
The marble costs $2.90 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 6 marbles and 3 stickers?
(a)
Choose the cheaper item to be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 marble = 1 u + 2.90
Cost of 6 stickers
= 6 x 1 u
= 6 u
Total cost of 1 marble and 6 stickers
= 1 u + 2.90 + 6 u
= 7 u + 2.90
7 u + 2.90 = 35.10
7 u = 35.10 - 2.90
7 u = 32.20
1 u = 32.20 ÷ 7 = 4.60
Cost of 1 marble
= 4.60 + 2.90
= $7.50
(b)
Cost of 6 marbles and 3 stickers
= 6 x 7.50 + 3 x 4.60
= 45.00 + 13.80
= $58.80
Answer(s): (a) $7.50; (b) $58.80