Adam pays $14 for 3 beads and 2 marbles.
2 beads cost as much as 1 marble.
- How much is 1 bead?
- How much is 1 marble?
- How much is 5 marbles and 2 beads?
(a)
Choose the smaller group to be 1 u.
Cost of 1 bead = 1 u
Cost of 2 beads = 2 u
Cost of 1 marble = 2 u
Cost of 3 beads
= 3 x 1 u
= 3 u
Cost of 2 marbles
= 2 x 2 u
= 4 u
Total cost of 3 beads and 2 marbles
= 3 u + 4 u
= 7 u
7 u = 14
1 u = 14 ÷ 7 = 2
Cost of 1 bead
= 1 u
= $2
(b)
Cost of 1 marble
= 2 u
= 2 x 2
= $4
(c)
Cost of 5 marbles and 2 beads
= 5 x 2 u + 2 x 1 u
= 10 u + 2 u
= 12 u
= 12 x 2
= $24
Answer(s): (a) $2; (b) $4; (c) $24