Adam buys a sticker for $2.
He also buys a marble.
The marble costs 4 times as much as the sticker.
- How much less does the marble cost than the sticker?
- How much does he spend altogether?
- How much are 5 marbles?
- How much are 3 marbles and 3 stickers?
(a)
Choose the cheaper item to be 1 u.
The marble costs 4 times as much as the sticker.
The sticker is cheaper.
Cost of the sticker = 1 u = $2
Cost of the marble = 4 u
Amount that the sticker costs less than the marble
= 4 u - 1 u
= 3 u
= 3 x 2
= $6
(b)
Total amount that Adam spends
= 1 u + 4 u
= 5 u
= 5 x 2
= $10
(c)
Cost of 5 marbles
= 5 x 4 u
= 20 u
= 20 x 2
= $40
(d )
Cost of 3 marbles and 3 stickers
= 3 x 4 u + 3 x 1 u
= 12 u + 3 u
= 15 u
= 15 x 2
= $30
Answer(s): (a) $6; (b) $10; (c) $40; (d) $30