Adam pays $32.60 for 1 marble and 6 stickers.
The marble costs $1.10 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 6 marbles and 2 stickers?
(a)
Choose the cheaper item to be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 marble = 1 u + 1.10
Cost of 6 stickers
= 6 x 1 u
= 6 u
Total cost of 1 marble and 6 stickers
= 1 u + 1.10 + 6 u
= 7 u + 1.10
7 u + 1.10 = 32.60
7 u = 32.60 - 1.10
7 u = 31.50
1 u = 31.50 ÷ 7 = 4.50
Cost of 1 marble
= 4.50 + 1.10
= $5.60
(b)
Cost of 6 marbles and 2 stickers
= 6 x 5.60 + 2 x 4.50
= 33.60 + 9.00
= $42.60
Answer(s): (a) $5.60; (b) $42.60