Adam pays $50 for 5 stickers and 4 marbles.
5 stickers cost as much as 1 marble.
- How much is 1 sticker?
- How much is 1 marble?
- How much is 4 marbles and 2 stickers?
(a)
Choose the smaller group to be 1 u.
Cost of 1 sticker = 1 u
Cost of 5 stickers = 5 u
Cost of 1 marble = 5 u
Cost of 5 stickers
= 5 x 1 u
= 5 u
Cost of 4 marbles
= 4 x 5 u
= 20 u
Total cost of 5 stickers and 4 marbles
= 5 u + 20 u
= 25 u
25 u = 50
1 u = 50 ÷ 25 = 2
Cost of 1 sticker
= 1 u
= $2
(b)
Cost of 1 marble
= 5 u
= 5 x 2
= $10
(c)
Cost of 4 marbles and 2 stickers
= 4 x 5 u + 2 x 1 u
= 20 u + 2 u
= 22 u
= 22 x 2
= $44
Answer(s): (a) $2; (b) $10; (c) $44