Adam buys a sticker for $9.
He also buys a bead.
The sticker costs 3 times as much as the bead.
- How much less does the bead cost than the sticker?
- How much does he spend altogether?
- How much are 3 beads?
- What is the difference in cost between 3 stickers and 3 beads?
(a)
Choose the cheaper item to be 1 u.
The sticker costs 3 times as much as the bead.
The bead is cheaper.
Cost of the bead = 1 u
Cost of the sticker = 3 u = $9
3 u = 9
1 u = 9 ÷ 3 = 3
Amount that the bead costs less than the sticker
= 3 u - 1 u
= 2 u
= 2 x 3
= $6
(b)
Total amount that Adam spends
= 1 u + 3 u
= 4 u
= 4 x 3
= $12
(c)
Cost of 3 beads
= 3 x 1 u
= 3 u
= 3 x 3
= $9
(d )
Difference in the cost between 6 stickers and 3 beads
= (3 x 3 u) - (3 x 1 u)
= 9 u - 3 u
= 6 u
= 6 x 3
= $18
Answer(s): (a) $6; (b) $12; (c) $9; (d) $18