Adam pays $35.60 for 1 marble and 5 stickers.
The marble costs $1.40 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 5 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 + 1.40
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 1.40 + 5 u
= 6 u + 1.40
6 u + 1.40 = 35.60
6 u = 35.60 - 1.40
6 u = 34.20
1 u = 34.20 ÷ 6 = 5.70
Cost of 1 marble
= 5.70 + 1.40
= $7.10
(b)
Cost of 5 marbles and 3 stickers
= 5 x 7.10 + 3 x 5.70
= 35.50 + 17.10
= $52.60
Answer(s): (a) $7.10; (b) $52.60