Adam pays $26.40 for 1 marble and 5 stickers.
The marble costs $1.20 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 + 1.20
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 1.20 + 5 u
= 6 u + 1.20
6 u + 1.20 = 26.40
6 u = 26.40 - 1.20
6 u = 25.20
1 u = 25.20 ÷ 6 = 4.20
Cost of 1 marble
= 4.20 + 1.20
= $5.40
(b)
Cost of 5 marbles and 8 stickers
= 5 x 5.40 + 8 x 4.20
= 27.00 + 33.60
= $60.60
Answer(s): (a) $5.40; (b) $60.60