Adam pays $2.80 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 2 marbles and 5 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 = 2.80
1 u = 2.80 ÷ 7 = 0.40
Cost of the bead
= 6 u
= 6 x 0.40
= $2.40
(b)
Cost of 2 marbles and 5 beads
= 2 x 1 u + 5 x 6 u
= 2 u + 30 u
= 32 u
= 32 x 0.40
= $12.80
Answer(s): (a) $2.40; (b) $12.80