Adam pays $44.80 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 8 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 = 44.80
6 u = 44.80 - 2.20
6 u = 42.60
1 u = 42.60 ÷ 6 = 7.10
Cost of 1 marble
= 7.10 + 2.20
= $9.30
(b)
Cost of 5 marbles and 8 stickers
= 5 x 9.30 + 8 x 7.10
= 46.50 + 56.80
= $103.30
Answer(s): (a) $9.30; (b) $103.30