Bryan pays $20 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 = 20
1 u = 20 ÷ 4 = 5
Cost of the bead
= 1 u
= $5
(b)
Cost of the sticker
= 3 u
= 3 x 5
= $15
(c)
Difference in the cost of the sticker and the bead
= 3 u - 1 u
= 2 u
= 2 x 5
= $10
Answer(s): (a) $5; (b) $15; (c) $10