Adam pays $10 for 4 marbles and 3 stickers.
4 marbles cost as much as 2 stickers.
- How much is 1 marble?
- How much is 1 sticker?
- How much is 5 stickers and 4 marbles?
(a)
Choose the smaller group to be 1 u.
Cost of 4 marbles = Cost of 2 stickers
Cost of 2 marbles = Cost of 1 sticker
Cost of 1 marble = 1 u
Cost of 1 sticker = 2 u
Cost of 4 marbles
= 4 x 1 u
= 4 u
Cost of 3 stickers
= 3 x 2 u
= 6 u
Total cost of 4 marbles and 3 stickers
= 4 u + 6 u
= 10 u
10 u = 10
1 u = 10 ÷ 10 = 1
Cost of 1 marble = 1 u = $1
(b)
Cost of 1 sticker
= 2 u
= 2 x 1
= $2
(c)
Cost of 5 stickers and 4 marbles
= 5 x 2 u + 4 x 1 u
= 10 u + 4 u
= 14 u
= 14 x 1
= $14
Answer(s): (a) $1; (b) $2; (c) $14