Adam spends $16.90 on 3 beads and 4 stickers.
A bead costs $2.60 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 + 2.60
Total cost of 3 beads and 4 stickers
= 3(1 u + 2.60) + 4 u
= 3 u + 7.80 + 4 u
= 3 u + 4 u + 7.80
= 7 u + 7.80
7 u + 7.80 = 16.90
7 u = 16.90 - 7.80
7 u = 9.10
1 u = 9.10 ÷ 7 = 1.30
Cost of 1 bead
= 1 u + 2.60
= 1.30 + 2.60
= $3.90
(b)
Cost of 8 beads
= 8 x 3.90
= $31.20
(c)
Cost of 1 sticker and 8 beads
= 1.30 + 31.20
= $32.50
(d)
Cost of 8 beads more than 1 sticker
= 31.20 - 1.30
= $29.90
Answer(s): (a) $3.90; (b) $31.20; (c) $32.50; (d) $29.90