Adam pays $30.50 for 1 marble and 5 stickers.
The marble costs $2.90 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 5 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 + 2.90
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 2.90 + 5 u
= 6 u + 2.90
6 u + 2.90 = 30.50
6 u = 30.50 - 2.90
6 u = 27.60
1 u = 27.60 ÷ 6 = 4.60
Cost of 1 marble
= 4.60 + 2.90
= $7.50
(b)
Cost of 5 marbles and 2 stickers
= 5 x 7.50 + 2 x 4.60
= 37.50 + 9.20
= $46.70
Answer(s): (a) $7.50; (b) $46.70