Adam spends $12.50 on 3 beads and 4 stickers.
A bead costs $1.60 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 + 1.60
Total cost of 3 beads and 4 stickers
= 3(1 u + 1.60) + 4 u
= 3 u + 4.80 + 4 u
= 3 u + 4 u + 4.80
= 7 u + 4.80
7 u + 4.80 = 12.50
7 u = 12.50 - 4.80
7 u = 7.70
1 u = 7.70 ÷ 7 = 1.10
Cost of 1 bead
= 1 u + 1.60
= 1.10 + 1.60
= $2.70
(b)
Cost of 8 beads
= 8 x 2.70
= $21.60
(c)
Cost of 1 sticker and 8 beads
= 1.10 + 21.60
= $22.70
(d)
Cost of 8 beads more than 1 sticker
= 21.60 - 1.10
= $20.50
Answer(s): (a) $2.70; (b) $21.60; (c) $22.70; (d) $20.50