Charlie pays $40 for a bead and a sticker.
The sticker costs thrice as much as the bead.
- Find the cost of the bead.
- Find the cost of the sticker.
- Find the difference in the cost of the sticker and the bead.
(a)
Choose the cheaper item to be 1 u.
The sticker costs thrice as much as the bead.
The bead is cheaper.
Cost of the bead = 1 u
Cost of the sticker = 3 u
Total cost = 1 u + 3 u = 4 u
4 u = 40
1 u = 40 ÷ 4 = 10
Cost of the bead
= 1 u
= $10
(b)
Cost of the sticker
= 3 u
= 3 x 10
= $30
(c)
Difference in the cost of the sticker and the bead
= 3 u - 1 u
= 2 u
= 2 x 10
= $20
Answer(s): (a) $10; (b) $30; (c) $20