Bryan pays $35 for a marble and a bead.
The bead costs four times as much as the marble.
- Find the cost of the marble.
- Find the cost of the bead.
- Find the difference in the cost of the bead and the marble.
(a)
Choose the cheaper item to be 1 u.
The bead costs four times as much as the marble.
The marble is cheaper.
Cost of the marble = 1 u
Cost of the bead = 4 u
Total cost = 1 u + 4 u = 5 u
5 u = 35
1 u = 35 ÷ 5 = 7
Cost of the marble
= 1 u
= $7
(b)
Cost of the bead
= 4 u
= 4 x 7
= $28
(c)
Difference in the cost of the bead and the marble
= 4 u - 1 u
= 3 u
= 3 x 7
= $21
Answer(s): (a) $7; (b) $28; (c) $21