Adam spends $14.80 on 3 stickers and 4 beads.
A sticker costs $1.90 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 + 1.90
Total cost of 3 stickers and 4 beads
= 3(1 u + 1.90) + 4 u
= 3 u + 5.70 + 4 u
= 3 u + 4 u + 5.70
= 7 u + 5.70
7 u + 5.70 = 14.80
7 u = 14.80 - 5.70
7 u = 9.10
1 u = 9.10 ÷ 7 = 1.30
Cost of 1 sticker
= 1 u + 1.90
= 1.30 + 1.90
= $3.20
(b)
Cost of 4 stickers
= 4 x 3.20
= $12.80
(c)
Cost of 1 bead and 4 stickers
= 1.30 + 12.80
= $14.10
(d)
Cost of 4 stickers more than 1 bead
= 12.80 - 1.30
= $11.50
Answer(s): (a) $3.20; (b) $12.80; (c) $14.10; (d) $11.50