Adam spends $15.20 on 3 beads and 4 stickers.
A bead costs $1.10 more than 1 sticker.
- How much does 1 bead cost?
- How much do 4 beads cost?
- How much do a sticker and 4 beads cost?
- How much do 4 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 + 1.10
Total cost of 3 beads and 4 stickers
= 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 bead
= 1 u + 1.10
= 1.70 + 1.10
= $2.80
(b)
Cost of 4 beads
= 4 x 2.80
= $11.20
(c)
Cost of 1 sticker and 4 beads
= 1.70 + 11.20
= $12.90
(d)
Cost of 4 beads more than 1 sticker
= 11.20 - 1.70
= $9.50
Answer(s): (a) $2.80; (b) $11.20; (c) $12.90; (d) $9.50
