Adam spends $14.30 on 3 stickers and 4 beads.
A sticker costs $2.20 more than 1 bead.
- How much does 1 sticker cost?
- How much do 4 stickers cost?
- How much do a bead and 4 stickers cost?
- How much do 4 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 = 14.30
7 u = 14.30 - 6.60
7 u = 7.70
1 u = 7.70 ÷ 7 = 1.10
Cost of 1 sticker
= 1 u + 2.20
= 1.10 + 2.20
= $3.30
(b)
Cost of 4 stickers
= 4 x 3.30
= $13.20
(c)
Cost of 1 bead and 4 stickers
= 1.10 + 13.20
= $14.30
(d)
Cost of 4 stickers more than 1 bead
= 13.20 - 1.10
= $12.10
Answer(s): (a) $3.30; (b) $13.20; (c) $14.30; (d) $12.10