Adam pays $3.60 for a bead and a marble.
The bead costs 8 times as much as the marble.
- What is the cost of 1 bead?
- How much is the cost of 2 marbles and 3 beads?
(a)
Cost of a marble = 1 u
Cost of a bead = 8 u
Total cost of a marble and a bead
= 1 u + 8 u
= 9 u
9 u = 3.60
1 u = 3.60 ÷ 9 = 0.40
Cost of the bead
= 8 u
= 8 x 0.40
= $3.20
(b)
Cost of 2 marbles and 3 beads
= 2 x 1 u + 3 x 8 u
= 2 u + 24 u
= 26 u
= 26 x 0.40
= $10.40
Answer(s): (a) $3.20; (b) $10.40