Adam spends $12.60 on 2 beads and 3 stickers.
A bead costs 3 times as much as 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 does 1 sticker cost less than 4 beads?
(a)
Let the cheaper item be 1 u.
Cost of 1 sticker = 1 u
Cost of 1 bead = 3 u
Cost of 2 beads = 2 x 3 u = 6 u
Cost of 3 stickers = 3 x 1 u = 3 u
Total cost of 2 beads and 3 stickers
= 6 u + 3 u
= 9 u
9 u = 12.60
1 u = 12.60 ÷ 9 = 1.40
Cost of 1 bead
= 3 u
= 3 x 1.40
= $4.20
(b)
Cost of 4 beads
= 4 x 4.20
= $16.80
(c)
Cost of 1 sticker and 4 beads
= 1.40 + 16.80
= $18.20
(d)
Cost of 1 sticker less than 4 beads
= 16.80 - 1.40
= $15.40
Answer(s): (a) $4.20; (b) $16.80; (c) $18.20; (d) $15.40