Adam spends $16.90 on 3 beads and 4 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 3 beads = 3 x 3 u = 9 u
Cost of 4 stickers = 4 x 1 u = 4 u
Total cost of 3 beads and 4 stickers
= 9 u + 4 u
= 13 u
13 u = 16.90
1 u = 16.90 ÷ 13 = 1.30
Cost of 1 bead
= 3 u
= 3 x 1.30
= $3.90
(b)
Cost of 4 beads
= 4 x 3.90
= $15.60
(c)
Cost of 1 sticker and 4 beads
= 1.30 + 15.60
= $16.90
(d)
Cost of 1 sticker less than 4 beads
= 15.60 - 1.30
= $14.30
Answer(s): (a) $3.90; (b) $15.60; (c) $16.90; (d) $14.30