Adam pays $19.40 for 1 marble and 5 stickers.
The marble costs $2.60 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 + 2.60
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 2.60 + 5 u
= 6 u + 2.60
6 u + 2.60 = 19.40
6 u = 19.40 - 2.60
6 u = 16.80
1 u = 16.80 ÷ 6 = 2.80
Cost of 1 marble
= 2.80 + 2.60
= $5.40
(b)
Cost of 5 marbles and 6 stickers
= 5 x 5.40 + 6 x 2.80
= 27.00 + 16.80
= $43.80
Answer(s): (a) $5.40; (b) $43.80