Adam pays $28 for 2 marbles and 4 stickers.
3 marbles cost as much as 1 sticker.
- How much is 1 marble?
- How much is 1 sticker?
- How much is 3 stickers and 5 marbles?
(a)
Choose the smaller group to be 1 u.
Cost of 1 marble = 1 u
Cost of 3 marbles = 3 u
Cost of 1 sticker = 3 u
Cost of 2 marbles
= 2 x 1 u
= 2 u
Cost of 4 stickers
= 4 x 3 u
= 12 u
Total cost of 2 marbles and 4 stickers
= 2 u + 12 u
= 14 u
14 u = 28
1 u = 28 ÷ 14 = 2
Cost of 1 marble
= 1 u
= $2
(b)
Cost of 1 sticker
= 3 u
= 3 x 2
= $6
(c)
Cost of 3 stickers and 5 marbles
= 3 x 3 u + 5 x 1 u
= 9 u + 5 u
= 14 u
= 14 x 2
= $28
Answer(s): (a) $2; (b) $6; (c) $28
