Adam pays $3.90 for a bead and a marble.
The bead costs 2 times as much as the marble.
- What is the cost of 1 bead?
- How much is the cost of 5 marbles and 2 beads?
(a)
Cost of a marble = 1 u
Cost of a bead = 2 u
Total cost of a marble and a bead
= 1 u + 2 u
= 3 u
3 u = 3.90
1 u = 3.90 ÷ 3 = 1.30
Cost of the bead
= 2 u
= 2 x 1.30
= $2.60
(b)
Cost of 5 marbles and 2 beads
= 5 x 1 u + 2 x 2 u
= 5 u + 4 u
= 9 u
= 9 x 1.30
= $11.70
Answer(s): (a) $2.60; (b) $11.70