If Adam buys 4 beads and 5 stickers, it costs $70.20.
If Adam buys 5 beads and 4 stickers, he will have $3.60 left.

1. Find the cost of 1 bead and 1 sticker.
2. Find the cost of 1 bead.
3. Find the cost of 1 sticker.

(a)
4 beads + 5 stickers = 70.20 --- (1)
5 beads + 4 stickers = 70.20 - 3.60 = 66.60 --- (2)

(1) + (2)
9 beads + 9 stickers = 136.80 --- (3)

(3) _{÷ 9}
1 bead + 1 sticker = 136.80 ÷ 9 = 15.20 --- (4)

Cost of 1 bead and 1 sticker = $15.20

(b)
(4) _{x 4}
4 beads + 4 stickers = 4 x 15.20 = 60.80 --- (5)

(2) - (5)
5 beads + 4 stickers - 4 beads - 4 stickers = 66.60 - 60.80
5 beads - 4 beads - 4 stickers + 4 stickers = 5.80
1 bead = 5.80

Cost of 1 bead = $5.80

(c)
Substitute 1 bead = 5.80 into (4).

1 bead + 1 sticker = 15.20
5.80 + 1 sticker = 15.20
1 sticker = 15.20 - 5.80 = 9.40

Cost of 1 sticker = $9.40

Answer(s): (a) $15.20; (b) $5.80; (c) $9.40