Adam pays $4.90 for a marble and a bead.
The marble costs 6 times as much as the bead.
- What is the cost of 1 marble?
- How much is the cost of 5 beads and 4 marbles?
(a)
Cost of a bead = 1 u
Cost of a marble = 6 u
Total cost of a bead and a marble
= 1 u + 6 u
= 7 u
7 u = 4.90
1 u = 4.90 ÷ 7 = 0.70
Cost of the marble
= 6 u
= 6 x 0.70
= $4.20
(b)
Cost of 5 beads and 4 marbles
= 5 x 1 u + 4 x 6 u
= 5 u + 24 u
= 29 u
= 29 x 0.70
= $20.30
Answer(s): (a) $4.20; (b) $20.30