Adam pays $1.80 for a bead and a marble.
The bead costs 5 times as much as the marble.
- What is the cost of 1 bead?
- How much is the cost of 3 marbles and 2 beads?
(a)
Cost of a marble = 1 u
Cost of a bead = 5 u
Total cost of a marble and a bead
= 1 u + 5 u
= 6 u
6 u = 1.80
1 u = 1.80 ÷ 6 = 0.30
Cost of the bead
= 5 u
= 5 x 0.30
= $1.50
(b)
Cost of 3 marbles and 2 beads
= 3 x 1 u + 2 x 5 u
= 3 u + 10 u
= 13 u
= 13 x 0.30
= $3.90
Answer(s): (a) $1.50; (b) $3.90