Adam pays $1.80 for a marble and a bead.
The marble costs 5 times as much as the bead.
- What is the cost of 1 marble?
- How much is the cost of 2 beads and 3 marbles?
(a)
Cost of a bead = 1 u
Cost of a marble = 5 u
Total cost of a bead and a marble
= 1 u + 5 u
= 6 u
6 u = 1.80
1 u = 1.80 ÷ 6 = 0.30
Cost of the marble
= 5 u
= 5 x 0.30
= $1.50
(b)
Cost of 2 beads and 3 marbles
= 2 x 1 u + 3 x 5 u
= 2 u + 15 u
= 17 u
= 17 x 0.30
= $5.10
Answer(s): (a) $1.50; (b) $5.10