Adam pays $3.30 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 3 marbles and 5 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 = 3.30
1 u = 3.30 ÷ 3 = 1.10
Cost of the bead
= 2 u
= 2 x 1.10
= $2.20
(b)
Cost of 3 marbles and 5 beads
= 3 x 1 u + 5 x 2 u
= 3 u + 10 u
= 13 u
= 13 x 1.10
= $14.30
Answer(s): (a) $2.20; (b) $14.30