Adam spends $15.20 on 3 stickers and 4 beads.
A sticker costs $1.10 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 + 1.10
Total cost of 3 stickers and 4 beads
= 3(1 u + 1.10) + 4 u
= 3 u + 3.30 + 4 u
= 3 u + 4 u + 3.30
= 7 u + 3.30
7 u + 3.30 = 15.20
7 u = 15.20 - 3.30
7 u = 11.90
1 u = 11.90 ÷ 7 = 1.70
Cost of 1 sticker
= 1 u + 1.10
= 1.70 + 1.10
= $2.80
(b)
Cost of 7 stickers
= 7 x 2.80
= $19.60
(c)
Cost of 1 bead and 7 stickers
= 1.70 + 19.60
= $21.30
(d)
Cost of 7 stickers more than 1 bead
= 19.60 - 1.70
= $17.90
Answer(s): (a) $2.80; (b) $19.60; (c) $21.30; (d) $17.90