Adam pays $22 for 5 stickers and 2 marbles.
3 stickers cost as much as 1 marble.
- How much is 1 sticker?
- How much is 1 marble?
- How much is 3 marbles and 5 stickers?
(a)
Choose the smaller group to be 1 u.
Cost of 1 sticker = 1 u
Cost of 3 stickers = 3 u
Cost of 1 marble = 3 u
Cost of 5 stickers
= 5 x 1 u
= 5 u
Cost of 2 marbles
= 2 x 3 u
= 6 u
Total cost of 5 stickers and 2 marbles
= 5 u + 6 u
= 11 u
11 u = 22
1 u = 22 ÷ 11 = 2
Cost of 1 sticker
= 1 u
= $2
(b)
Cost of 1 marble
= 3 u
= 3 x 2
= $6
(c)
Cost of 3 marbles and 5 stickers
= 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