Adam pays $1.80 for a marble and a bead.
The marble costs 2 times as much as the bead.
- What is the cost of 1 marble?
- How much is the cost of 5 beads and 2 marbles?
(a)
Cost of a bead = 1 u
Cost of a marble = 2 u
Total cost of a bead and a marble
= 1 u + 2 u
= 3 u
3 u = 1.80
1 u = 1.80 ÷ 3 = 0.60
Cost of the marble
= 2 u
= 2 x 0.60
= $1.20
(b)
Cost of 5 beads and 2 marbles
= 5 x 1 u + 2 x 2 u
= 5 u + 4 u
= 9 u
= 9 x 0.60
= $5.40
Answer(s): (a) $1.20; (b) $5.40