Bryan pays $25 for a sticker and a marble.
The marble costs four times as much as the sticker.
- Find the cost of the sticker.
- Find the cost of the marble.
- Find the difference in the cost of the marble and the sticker.
(a)
Choose the cheaper item to be 1 u.
The marble costs four times as much as the sticker.
The sticker is cheaper.
Cost of the sticker = 1 u
Cost of the marble = 4 u
Total cost = 1 u + 4 u = 5 u
5 u = 25
1 u = 25 ÷ 5 = 5
Cost of the sticker
= 1 u
= $5
(b)
Cost of the marble
= 4 u
= 4 x 5
= $20
(c)
Difference in the cost of the marble and the sticker
= 4 u - 1 u
= 3 u
= 3 x 5
= $15
Answer(s): (a) $5; (b) $20; (c) $15