Adam pays $36.60 for 1 marble and 5 stickers.
The marble costs $1.80 more than each sticker.
- What is the cost of 1 marble?
- How much is the cost of 5 marbles and 4 stickers?
(a)
Choose the cheaper item to be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 marble = 1 u + 1.80
Cost of 5 stickers
= 5 x 1 u
= 5 u
Total cost of 1 marble and 5 stickers
= 1 u + 1.80 + 5 u
= 6 u + 1.80
6 u + 1.80 = 36.60
6 u = 36.60 - 1.80
6 u = 34.80
1 u = 34.80 ÷ 6 = 5.80
Cost of 1 marble
= 5.80 + 1.80
= $7.60
(b)
Cost of 5 marbles and 4 stickers
= 5 x 7.60 + 4 x 5.80
= 38.00 + 23.20
= $61.20
Answer(s): (a) $7.60; (b) $61.20