Adam spends $16.90 on 2 beads and 3 stickers.
A bead costs $2.20 more than 1 sticker.
- How much does 1 bead cost?
- How much do 3 beads cost?
- How much do a sticker and 3 beads cost?
- How much do 3 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 + 2.20
Total cost of 2 beads and 3 stickers
= 2(1 u + 2.20) + 3 u
= 2 u + 4.40 + 3 u
= 2 u + 3 u + 4.40
= 5 u + 4.40
5 u + 4.40 = 16.90
5 u = 16.90 - 4.40
5 u = 12.50
1 u = 12.50 ÷ 5 = 2.50
Cost of 1 bead
= 1 u + 2.20
= 2.50 + 2.20
= $4.70
(b)
Cost of 3 beads
= 3 x 4.70
= $14.10
(c)
Cost of 1 sticker and 3 beads
= 2.50 + 14.10
= $16.60
(d)
Cost of 3 beads more than 1 sticker
= 14.10 - 2.50
= $11.60
Answer(s): (a) $4.70; (b) $14.10; (c) $16.60; (d) $11.60