Adam buys a sticker for $10.
He also buys a bead.
The sticker costs 5 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 7 beads?
- What is the difference in cost between 2 stickers and 3 beads?
(a)
Choose the cheaper item to be 1 u.
The sticker costs 5 times as much as the bead.
The bead is cheaper.
Cost of the bead = 1 u
Cost of the sticker = 5 u = $10
5 u = 10
1 u = 10 ÷ 5 = 2
Amount that the bead costs less than the sticker
= 5 u - 1 u
= 4 u
= 4 x 2
= $8
(b)
Total amount that Adam spends
= 1 u + 5 u
= 6 u
= 6 x 2
= $12
(c)
Cost of 7 beads
= 7 x 1 u
= 7 u
= 7 x 2
= $14
(d )
Difference in the cost between 8 stickers and 3 beads
= (2 x 5 u) - (3 x 1 u)
= 10 u - 3 u
= 7 u
= 7 x 2
= $14
Answer(s): (a) $8; (b) $12; (c) $14; (d) $14