Adam pays $28 for 3 marbles and 2 stickers.
2 marbles cost as much as 1 sticker.
- How much is 1 marble?
- How much is 1 sticker?
- How much is 5 stickers and 2 marbles?
(a)
Choose the smaller group to be 1 u.
Cost of 1 marble = 1 u
Cost of 2 marbles = 2 u
Cost of 1 sticker = 2 u
Cost of 3 marbles
= 3 x 1 u
= 3 u
Cost of 2 stickers
= 2 x 2 u
= 4 u
Total cost of 3 marbles and 2 stickers
= 3 u + 4 u
= 7 u
7 u = 28
1 u = 28 ÷ 7 = 4
Cost of 1 marble
= 1 u
= $4
(b)
Cost of 1 sticker
= 2 u
= 2 x 4
= $8
(c)
Cost of 5 stickers and 2 marbles
= 5 x 2 u + 2 x 1 u
= 10 u + 2 u
= 12 u
= 12 x 4
= $48
Answer(s): (a) $4; (b) $8; (c) $48