Adam spends $12.40 on 3 beads and 4 stickers.
A bead costs $1.10 more than 1 sticker.
- How much does 1 bead cost?
- How much do 8 beads cost?
- How much do a sticker and 8 beads cost?
- How much do 8 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 = 12.40
7 u = 12.40 - 3.30
7 u = 9.10
1 u = 9.10 ÷ 7 = 1.30
Cost of 1 bead
= 1 u + 1.10
= 1.30 + 1.10
= $2.40
(b)
Cost of 8 beads
= 8 x 2.40
= $19.20
(c)
Cost of 1 sticker and 8 beads
= 1.30 + 19.20
= $20.50
(d)
Cost of 8 beads more than 1 sticker
= 19.20 - 1.30
= $17.90
Answer(s): (a) $2.40; (b) $19.20; (c) $20.50; (d) $17.90