Adam pays $3.20 for a bead and a sticker.
The bead costs 7 times as much as the sticker.
- What is the cost of 1 bead?
- How much is the cost of 3 stickers and 4 beads?
(a)
Cost of a sticker = 1 u
Cost of a bead = 7 u
Total cost of a sticker and a bead
= 1 u + 7 u
= 8 u
8 u = 3.20
1 u = 3.20 ÷ 8 = 0.40
Cost of the bead
= 7 u
= 7 x 0.40
= $2.80
(b)
Cost of 3 stickers and 4 beads
= 3 x 1 u + 4 x 7 u
= 3 u + 28 u
= 31 u
= 31 x 0.40
= $12.40
Answer(s): (a) $2.80; (b) $12.40