Adam spends $12.10 on 3 beads and 4 stickers.
A bead costs $2.40 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 + 2.40
Total cost of 3 beads and 4 stickers
= 3(1 u + 2.40) + 4 u
= 3 u + 7.20 + 4 u
= 3 u + 4 u + 7.20
= 7 u + 7.20
7 u + 7.20 = 12.10
7 u = 12.10 - 7.20
7 u = 4.90
1 u = 4.90 ÷ 7 = 0.70
Cost of 1 bead
= 1 u + 2.40
= 0.70 + 2.40
= $3.10
(b)
Cost of 4 beads
= 4 x 3.10
= $12.40
(c)
Cost of 1 sticker and 4 beads
= 0.70 + 12.40
= $13.10
(d)
Cost of 4 beads more than 1 sticker
= 12.40 - 0.70
= $11.70
Answer(s): (a) $3.10; (b) $12.40; (c) $13.10; (d) $11.70