Adam buys a marble for $7.
He also buys a sticker.
The sticker costs 2 times as much as the marble.
- How much less does the sticker cost than the marble?
- How much does he spend altogether?
- How much are 4 stickers?
- How much are 2 stickers and 4 marbles?
(a)
Choose the cheaper item to be 1 u.
The sticker costs 2 times as much as the marble.
The marble is cheaper.
Cost of the marble = 1 u = $7
Cost of the sticker = 2 u
Amount that the marble costs less than the sticker
= 2 u - 1 u
= 1 u
= 1 x 7
= $7
(b)
Total amount that Adam spends
= 1 u + 2 u
= 3 u
= 3 x 7
= $21
(c)
Cost of 4 stickers
= 4 x 2 u
= 8 u
= 8 x 7
= $56
(d )
Cost of 2 stickers and 4 marbles
= 2 x 2 u + 4 x 1 u
= 4 u + 4 u
= 8 u
= 8 x 7
= $56
Answer(s): (a) $7; (b) $21; (c) $56; (d) $56