Adam pays $1.80 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 5 marbles and 4 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 = 1.80
1 u = 1.80 ÷ 9 = 0.20
Cost of the bead
= 8 u
= 8 x 0.20
= $1.60
(b)
Cost of 5 marbles and 4 beads
= 5 x 1 u + 4 x 8 u
= 5 u + 32 u
= 37 u
= 37 x 0.20
= $7.40
Answer(s): (a) $1.60; (b) $7.40