Adam buys a sticker for $4.
He also buys a marble.
The marble costs 3 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 4 marbles?
- How much are 3 marbles and 3 stickers?
(a)
Choose the cheaper item to be 1 u.
The marble costs 3 times as much as the sticker.
The sticker is cheaper.
Cost of the sticker = 1 u = $4
Cost of the marble = 3 u
Amount that the sticker costs less than the marble
= 3 u - 1 u
= 2 u
= 2 x 4
= $8
(b)
Total amount that Adam spends
= 1 u + 3 u
= 4 u
= 4 x 4
= $16
(c)
Cost of 4 marbles
= 4 x 3 u
= 12 u
= 12 x 4
= $48
(d )
Cost of 3 marbles and 3 stickers
= 3 x 3 u + 3 x 1 u
= 9 u + 3 u
= 12 u
= 12 x 4
= $48
Answer(s): (a) $8; (b) $16; (c) $48; (d) $48