Adam pays $20 for 3 beads and 4 stickers.
2 beads cost as much as 4 stickers.
- How much is 1 bead?
- How much is 1 sticker?
- How much is 3 stickers and 5 beads?
(a)
LCM of 2 and 4 = 4
Cost of 2 beads = 4 u
Cost of 1 bead = 4 u ÷ 2 = 2 u
Cost of 4 stickers = 4 u
Cost of 1 sticker = 4 u ÷ 4 = 1 u
Cost of 3 beads = 3 x 2 u = 6 u
Cost of 4 stickers = 4 x 1 u = 4 u
Total cost of 3 beads and 4 stickers
= 6 u + 4 u
= 10 u
10 u = 20
1 u = 20 ÷ 10 = 2
Cost of 1 bead
= 2 u
= 2 x 2
= $4
(b)
Cost of 1 sticker
= 1 u
= 1 x 2
= $2
(c)
Cost of 3 stickers and 5 beads
= 3 x 1 u + 5 x 2 u
= 3 u + 10 u
= 13 u
= 13 x 2
= $26
Answer(s): (a) $4; (b) $2; (c) $26