Adam pays $26.10 for 1 marble and 6 stickers.
The marble costs $1.60 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 6 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 + 1.60
Cost of 6 stickers
= 6 x 1 u
= 6 u
Total cost of 1 marble and 6 stickers
= 1 u + 1.60 + 6 u
= 7 u + 1.60
7 u + 1.60 = 26.10
7 u = 26.10 - 1.60
7 u = 24.50
1 u = 24.50 ÷ 7 = 3.50
Cost of 1 marble
= 3.50 + 1.60
= $5.10
(b)
Cost of 6 marbles and 3 stickers
= 6 x 5.10 + 3 x 3.50
= 30.60 + 10.50
= $41.10
Answer(s): (a) $5.10; (b) $41.10