Adam pays $27.40 for 1 marble and 5 stickers.
The marble costs $2.20 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 5 marbles and 6 stickers?
(a)
Choose the cheaper item to be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 marble = 1 u + 2.20
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 2.20 + 5 u
= 6 u + 2.20
6 u + 2.20 = 27.40
6 u = 27.40 - 2.20
6 u = 25.20
1 u = 25.20 ÷ 6 = 4.20
Cost of 1 marble
= 4.20 + 2.20
= $6.40
(b)
Cost of 5 marbles and 6 stickers
= 5 x 6.40 + 6 x 4.20
= 32.00 + 25.20
= $57.20
Answer(s): (a) $6.40; (b) $57.20