Adam pays $32.50 for 1 marble and 5 stickers.
The marble costs $1.30 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 5 marbles and 4 stickers?
(a)
Choose the cheaper item to be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 marble = 1 u + 1.30
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 1.30 + 5 u
= 6 u + 1.30
6 u + 1.30 = 32.50
6 u = 32.50 - 1.30
6 u = 31.20
1 u = 31.20 ÷ 6 = 5.20
Cost of 1 marble
= 5.20 + 1.30
= $6.50
(b)
Cost of 5 marbles and 4 stickers
= 5 x 6.50 + 4 x 5.20
= 32.50 + 20.80
= $53.30
Answer(s): (a) $6.50; (b) $53.30