Adam pays $25.30 for 1 marble and 5 stickers.
The marble costs $1.90 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 5 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 + 1.90
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 1.90 + 5 u
= 6 u + 1.90
6 u + 1.90 = 25.30
6 u = 25.30 - 1.90
6 u = 23.40
1 u = 23.40 ÷ 6 = 3.90
Cost of 1 marble
= 3.90 + 1.90
= $5.80
(b)
Cost of 5 marbles and 2 stickers
= 5 x 5.80 + 2 x 3.90
= 29.00 + 7.80
= $36.80
Answer(s): (a) $5.80; (b) $36.80