Adam pays $13 for 4 beads and 3 stickers.
9 beads cost as much as 3 stickers.
- How much is 1 bead?
- How much is 1 sticker?
- How much is 5 stickers and 2 beads?
(a)
Choose the smaller group to be 1 u.
Cost of 9 beads = Cost of 3 stickers
Cost of 3 beads = Cost of 1 sticker
Cost of 1 bead = 1 u
Cost of 1 sticker = 3 u
Cost of 4 beads
= 4 x 1 u
= 4 u
Cost of 3 stickers
= 3 x 3 u
= 9 u
Total cost of 4 beads and 3 stickers
= 4 u + 9 u
= 13 u
13 u = 13
1 u = 13 ÷ 13 = 1
Cost of 1 bead = 1 u = $1
(b)
Cost of 1 sticker
= 3 u
= 3 x 1
= $3
(c)
Cost of 5 stickers and 2 beads
= 5 x 3 u + 2 x 1 u
= 15 u + 2 u
= 17 u
= 17 x 1
= $17
Answer(s): (a) $1; (b) $3; (c) $17