Adam pays $24.10 for 1 marble and 6 stickers.
The marble costs $2.40 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 6 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 + 2.40
Cost of 6 stickers
= 6 x 1 u
= 6 u
Total cost of 1 marble and 6 stickers
= 1 u + 2.40 + 6 u
= 7 u + 2.40
7 u + 2.40 = 24.10
7 u = 24.10 - 2.40
7 u = 21.70
1 u = 21.70 ÷ 7 = 3.10
Cost of 1 marble
= 3.10 + 2.40
= $5.50
(b)
Cost of 6 marbles and 2 stickers
= 6 x 5.50 + 2 x 3.10
= 33.00 + 6.20
= $39.20
Answer(s): (a) $5.50; (b) $39.20