Adam spends $15.60 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 = 15.60
7 u = 15.60 - 7.20
7 u = 8.40
1 u = 8.40 ÷ 7 = 1.20
Cost of 1 bead
= 1 u + 2.40
= 1.20 + 2.40
= $3.60
(b)
Cost of 4 beads
= 4 x 3.60
= $14.40
(c)
Cost of 1 sticker and 4 beads
= 1.20 + 14.40
= $15.60
(d)
Cost of 4 beads more than 1 sticker
= 14.40 - 1.20
= $13.20
Answer(s): (a) $3.60; (b) $14.40; (c) $15.60; (d) $13.20