Adam pays $4.80 for a bead and a marble.
The bead costs 2 times as much as the marble.
- What is the cost of 1 bead?
- How much is the cost of 5 marbles and 3 beads?
(a)
Cost of a marble = 1 u
Cost of a bead = 2 u
Total cost of a marble and a bead
= 1 u + 2 u
= 3 u
3 u = 4.80
1 u = 4.80 ÷ 3 = 1.60
Cost of the bead
= 2 u
= 2 x 1.60
= $3.20
(b)
Cost of 5 marbles and 3 beads
= 5 x 1 u + 3 x 2 u
= 5 u + 6 u
= 11 u
= 11 x 1.60
= $17.60
Answer(s): (a) $3.20; (b) $17.60