Adam pays $4.90 for a bead and a marble.
The bead costs 6 times as much as the marble.
- What is the cost of 1 bead?
- How much is the cost of 4 marbles and 2 beads?
(a)
Cost of a marble = 1 u
Cost of a bead = 6 u
Total cost of a marble and a bead
= 1 u + 6 u
= 7 u
7 u = 4.90
1 u = 4.90 ÷ 7 = 0.70
Cost of the bead
= 6 u
= 6 x 0.70
= $4.20
(b)
Cost of 4 marbles and 2 beads
= 4 x 1 u + 2 x 6 u
= 4 u + 12 u
= 16 u
= 16 x 0.70
= $11.20
Answer(s): (a) $4.20; (b) $11.20