Adam spends $15.70 on 3 stickers and 4 beads.
A sticker costs $2.20 more than 1 bead.
- How much does 1 sticker cost?
- How much do 7 stickers cost?
- How much do a bead and 7 stickers cost?
- How much do 7 stickers cost more than 1 bead?
(a)
Let the cheaper item be 1 u.
Cost of 1 bead = 1 u
Cost of 1 sticker = 1 u + 2.20
Total cost of 3 stickers and 4 beads
= 3(1 u + 2.20) + 4 u
= 3 u + 6.60 + 4 u
= 3 u + 4 u + 6.60
= 7 u + 6.60
7 u + 6.60 = 15.70
7 u = 15.70 - 6.60
7 u = 9.10
1 u = 9.10 ÷ 7 = 1.30
Cost of 1 sticker
= 1 u + 2.20
= 1.30 + 2.20
= $3.50
(b)
Cost of 7 stickers
= 7 x 3.50
= $24.50
(c)
Cost of 1 bead and 7 stickers
= 1.30 + 24.50
= $25.80
(d)
Cost of 7 stickers more than 1 bead
= 24.50 - 1.30
= $23.20
Answer(s): (a) $3.50; (b) $24.50; (c) $25.80; (d) $23.20
