Adam pays $32.30 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 4 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 = 32.30
6 u = 32.30 - 2.90
6 u = 29.40
1 u = 29.40 ÷ 6 = 4.90
Cost of 1 marble
= 4.90 + 2.90
= $7.80
(b)
Cost of 5 marbles and 4 stickers
= 5 x 7.80 + 4 x 4.90
= 39.00 + 19.60
= $58.60
Answer(s): (a) $7.80; (b) $58.60