Adam pays $26.90 for 1 marble and 4 stickers.
The marble costs $2.40 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 4 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 + 2.40
Cost of 4 stickers
= 4 x 1 u
= 4 u
Total cost of 1 marble and 4 stickers
= 1 u + 2.40 + 4 u
= 5 u + 2.40
5 u + 2.40 = 26.90
5 u = 26.90 - 2.40
5 u = 24.50
1 u = 24.50 ÷ 5 = 4.90
Cost of 1 marble
= 4.90 + 2.40
= $7.30
(b)
Cost of 4 marbles and 3 stickers
= 4 x 7.30 + 3 x 4.90
= 29.20 + 14.70
= $43.90
Answer(s): (a) $7.30; (b) $43.90