Adam spends $15.90 on 2 beads and 3 stickers.
A bead costs $1.70 more than 1 sticker.
- How much does 1 bead cost?
- How much do 3 beads cost?
- How much do a sticker and 3 beads cost?
- How much do 3 beads cost more than 1 sticker?
(a)
Let the cheaper item be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 bead = 1 u + 1.70
Total cost of 2 beads and 3 stickers
= 2(1 u + 1.70) + 3 u
= 2 u + 3.40 + 3 u
= 2 u + 3 u + 3.40
= 5 u + 3.40
5 u + 3.40 = 15.90
5 u = 15.90 - 3.40
5 u = 12.50
1 u = 12.50 ÷ 5 = 2.50
Cost of 1 bead
= 1 u + 1.70
= 2.50 + 1.70
= $4.20
(b)
Cost of 3 beads
= 3 x 4.20
= $12.60
(c)
Cost of 1 sticker and 3 beads
= 2.50 + 12.60
= $15.10
(d)
Cost of 3 beads more than 1 sticker
= 12.60 - 2.50
= $10.10
Answer(s): (a) $4.20; (b) $12.60; (c) $15.10; (d) $10.10