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