Adam pays $2.10 for a bead and a marble.
The bead costs 6 times as much as the marble.
- What is the cost of 1 bead?
- How much is the cost of 3 marbles and 4 beads?
(a)
Cost of a marble = 1 u
Cost of a bead = 6 u
Total cost of a marble and a bead
= 1 u + 6 u
= 7 u
7 u = 2.10
1 u = 2.10 ÷ 7 = 0.30
Cost of the bead
= 6 u
= 6 x 0.30
= $1.80
(b)
Cost of 3 marbles and 4 beads
= 3 x 1 u + 4 x 6 u
= 3 u + 24 u
= 27 u
= 27 x 0.30
= $8.10
Answer(s): (a) $1.80; (b) $8.10