Adam pays $40.10 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 8 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 = 40.10
6 u = 40.10 - 2.30
6 u = 37.80
1 u = 37.80 ÷ 6 = 6.30
Cost of 1 marble
= 6.30 + 2.30
= $8.60
(b)
Cost of 5 marbles and 8 stickers
= 5 x 8.60 + 8 x 6.30
= 43.00 + 50.40
= $93.40
Answer(s): (a) $8.60; (b) $93.40