Adam pays $26.80 for a marble, a bead and a sticker.
The marble costs $3.10 less than the bead.
The bead costs $1.40 less than the sticker.
What is the cost of 5 stickers more than 2 marbles?
Choose the cheapest item to be 1 u.

Cost of the marble = 1 u
Cost of the bead = 1 u + 3.10
Cost of the sticker = 1 u + 3.10 + 1.40 = 1 u + 4.50

Total cost of the marble, the bead and the sticker
= 1 u + 1 u + 3.10 + 1 u + 4.50
= 3 u + 7.60

3 u + 7.60 = 26.80
3 u = 26.80 - 7.60
3 u = 19.20

1 u = 19.20 ÷ 3 = 6.40

Cost of 5 stickers more than 2 marbles
= 5 x (1 u + 4.50) - 2 x 1 u
= 5 u + 22.50 - 2 u
= 3 u + 22.50
= 3 x 6.40 + 22.50
= 19.20 + 22.50
= $41.70

Answer(s): $41.70