Adam spends $15.50 on 3 beads and 4 stickers.
A bead costs $1.20 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 + 1.20
Total cost of 3 beads and 4 stickers
= 3(1 u + 1.20) + 4 u
= 3 u + 3.60 + 4 u
= 3 u + 4 u + 3.60
= 7 u + 3.60
7 u + 3.60 = 15.50
7 u = 15.50 - 3.60
7 u = 11.90
1 u = 11.90 ÷ 7 = 1.70
Cost of 1 bead
= 1 u + 1.20
= 1.70 + 1.20
= $2.90
(b)
Cost of 4 beads
= 4 x 2.90
= $11.60
(c)
Cost of 1 sticker and 4 beads
= 1.70 + 11.60
= $13.30
(d)
Cost of 4 beads more than 1 sticker
= 11.60 - 1.70
= $9.90
Answer(s): (a) $2.90; (b) $11.60; (c) $13.30; (d) $9.90