Adam pays $3.00 for a bead and a marble.
The bead costs 9 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 = 9 u
Total cost of a marble and a bead
= 1 u + 9 u
= 10 u
10 u = 3.00
1 u = 3.00 ÷ 10 = 0.30
Cost of the bead
= 9 u
= 9 x 0.30
= $2.70
(b)
Cost of 5 marbles and 4 beads
= 5 x 1 u + 4 x 9 u
= 5 u + 36 u
= 41 u
= 41 x 0.30
= $12.30
Answer(s): (a) $2.70; (b) $12.30