Adam pays $26.90 for 1 marble and 5 stickers.
The marble costs $2.30 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 5 marbles and 6 stickers?
(a)
Choose the cheaper item to be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 marble = 1 u + 2.30
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 2.30 + 5 u
= 6 u + 2.30
6 u + 2.30 = 26.90
6 u = 26.90 - 2.30
6 u = 24.60
1 u = 24.60 ÷ 6 = 4.10
Cost of 1 marble
= 4.10 + 2.30
= $6.40
(b)
Cost of 5 marbles and 6 stickers
= 5 x 6.40 + 6 x 4.10
= 32.00 + 24.60
= $56.60
Answer(s): (a) $6.40; (b) $56.60