Adam pays $10.90 for 2 stickers and 3 beads.
A sticker costs $4.70 more than 1 bead.
What is the cost of 4 stickers and 3 beads?
Choose the cheaper item to be 1 u.
1 sticker costs $4.70 more than 1 bead.
The cheaper item is the bead.

Cost of the bead = 1 u
Cost of the sticker = 1 u + 4.70

Cost of 2 stickers = 2 x (1 u + 4.70) = 2 u + 9.40
Cost of 3 beads = 3 u

Total cost of 2 stickers and 3 beads
= 2 u + 9.40 + 3 u
= 2 u + 3 u + 9.40
= 5 u + 9.40

5 u + 9.40 = 10.90
5 u = 10.90 - 9.40
5 u = 1.50

1 u = 1.50 ÷ 5 = 0.30

Cost of 4 stickers and 3 beads
= 4 x (1 u + 4.70) + 3 u
= 4 u + 18.80 + 3 u
= 4 u + 3 u + 18.80
= 7 u + 18.80
= 7 x 0.30 + 18.80
= 2.10 + 18.80
= $20.90

Answer(s): $20.90