Adam spends $15.30 on 3 beads and 4 stickers.
A bead costs $1.60 more than 1 sticker.
- How much does 1 bead cost?
- How much do 6 beads cost?
- How much do a sticker and 6 beads cost?
- How much do 6 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 + 1.60
Total cost of 3 beads and 4 stickers
= 3(1 u + 1.60) + 4 u
= 3 u + 4.80 + 4 u
= 3 u + 4 u + 4.80
= 7 u + 4.80
7 u + 4.80 = 15.30
7 u = 15.30 - 4.80
7 u = 10.50
1 u = 10.50 ÷ 7 = 1.50
Cost of 1 bead
= 1 u + 1.60
= 1.50 + 1.60
= $3.10
(b)
Cost of 6 beads
= 6 x 3.10
= $18.60
(c)
Cost of 1 sticker and 6 beads
= 1.50 + 18.60
= $20.10
(d)
Cost of 6 beads more than 1 sticker
= 18.60 - 1.50
= $17.10
Answer(s): (a) $3.10; (b) $18.60; (c) $20.10; (d) $17.10