Adam spends $15.10 on 2 beads and 3 stickers.
A bead costs $2.80 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 + 2.80
Total cost of 2 beads and 3 stickers
= 2(1 u + 2.80) + 3 u
= 2 u + 5.60 + 3 u
= 2 u + 3 u + 5.60
= 5 u + 5.60
5 u + 5.60 = 15.10
5 u = 15.10 - 5.60
5 u = 9.50
1 u = 9.50 ÷ 5 = 1.90
Cost of 1 bead
= 1 u + 2.80
= 1.90 + 2.80
= $4.70
(b)
Cost of 4 beads
= 4 x 4.70
= $18.80
(c)
Cost of 1 sticker and 4 beads
= 1.90 + 18.80
= $20.70
(d)
Cost of 4 beads more than 1 sticker
= 18.80 - 1.90
= $16.90
Answer(s): (a) $4.70; (b) $18.80; (c) $20.70; (d) $16.90