Adam spends $16.90 on 3 stickers and 4 beads.
A sticker costs $1.20 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 + 1.20
Total cost of 3 stickers and 4 beads
= 3(1 u + 1.20) + 4 u
= 3 u + 3.60 + 4 u
= 3 u + 4 u + 3.60
= 7 u + 3.60
7 u + 3.60 = 16.90
7 u = 16.90 - 3.60
7 u = 13.30
1 u = 13.30 ÷ 7 = 1.90
Cost of 1 sticker
= 1 u + 1.20
= 1.90 + 1.20
= $3.10
(b)
Cost of 4 stickers
= 4 x 3.10
= $12.40
(c)
Cost of 1 bead and 4 stickers
= 1.90 + 12.40
= $14.30
(d)
Cost of 4 stickers more than 1 bead
= 12.40 - 1.90
= $10.50
Answer(s): (a) $3.10; (b) $12.40; (c) $14.30; (d) $10.50