Adam pays $2.10 for a marble and a bead.
The marble costs 6 times as much as the bead.
- What is the cost of 1 marble?
- How much is the cost of 2 beads and 5 marbles?
(a)
Cost of a bead = 1 u
Cost of a marble = 6 u
Total cost of a bead and a marble
= 1 u + 6 u
= 7 u
7 u = 2.10
1 u = 2.10 ÷ 7 = 0.30
Cost of the marble
= 6 u
= 6 x 0.30
= $1.80
(b)
Cost of 2 beads and 5 marbles
= 2 x 1 u + 5 x 6 u
= 2 u + 30 u
= 32 u
= 32 x 0.30
= $9.60
Answer(s): (a) $1.80; (b) $9.60