Adam pays $19 for 3 beads and 2 stickers.
5 beads cost as much as 3 stickers.
- How much is 1 bead?
- How much is 1 sticker?
- How much is 5 stickers and 4 beads?
(a)
LCM of 5 and 3 = 15
Cost of 5 beads = 15 u
Cost of 1 bead = 15 u ÷ 5 = 3 u
Cost of 3 stickers = 15 u
Cost of 1 sticker = 15 u ÷ 3 = 5 u
Cost of 3 beads = 3 x 3 u = 9 u
Cost of 2 stickers = 2 x 5 u = 10 u
Total cost of 3 beads and 2 stickers
= 9 u + 10 u
= 19 u
19 u = 19
1 u = 19 ÷ 19 = 1
Cost of 1 bead
= 3 u
= 3 x 1
= $3
(b)
Cost of 1 sticker
= 5 u
= 5 x 1
= $5
(c)
Cost of 5 stickers and 4 beads
= 5 x 5 u + 4 x 3 u
= 25 u + 12 u
= 37 u
= 37 x 1
= $37
Answer(s): (a) $3; (b) $5; (c) $37