Adam pays $1.50 for a marble and a bead.
The marble costs 4 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 = 4 u
Total cost of a bead and a marble
= 1 u + 4 u
= 5 u
5 u = 1.50
1 u = 1.50 ÷ 5 = 0.30
Cost of the marble
= 4 u
= 4 x 0.30
= $1.20
(b)
Cost of 5 beads and 2 marbles
= 5 x 1 u + 2 x 4 u
= 5 u + 8 u
= 13 u
= 13 x 0.30
= $3.90
Answer(s): (a) $1.20; (b) $3.90