Adam pays $14 for 2 stickers and 3 marbles.
8 stickers cost as much as 2 marbles.
- How much is 1 sticker?
- How much is 1 marble?
- How much is 2 marbles and 5 stickers?
(a)
Choose the smaller group to be 1 u.
Cost of 8 stickers = Cost of 2 marbles
Cost of 4 stickers = Cost of 1 marble
Cost of 1 sticker = 1 u
Cost of 1 marble = 4 u
Cost of 2 stickers
= 2 x 1 u
= 2 u
Cost of 3 marbles
= 3 x 4 u
= 12 u
Total cost of 2 stickers and 3 marbles
= 2 u + 12 u
= 14 u
14 u = 14
1 u = 14 ÷ 14 = 1
Cost of 1 sticker = 1 u = $1
(b)
Cost of 1 marble
= 4 u
= 4 x 1
= $4
(c)
Cost of 2 marbles and 5 stickers
= 2 x 4 u + 5 x 1 u
= 8 u + 5 u
= 13 u
= 13 x 1
= $13
Answer(s): (a) $1; (b) $4; (c) $13