Adam pays $34 for 5 stickers and 3 marbles.
4 stickers cost as much as 1 marble.
- How much is 1 sticker?
- How much is 1 marble?
- How much is 3 marbles and 4 stickers?
(a)
Choose the smaller group to be 1 u.
Cost of 1 sticker = 1 u
Cost of 4 stickers = 4 u
Cost of 1 marble = 4 u
Cost of 5 stickers
= 5 x 1 u
= 5 u
Cost of 3 marbles
= 3 x 4 u
= 12 u
Total cost of 5 stickers and 3 marbles
= 5 u + 12 u
= 17 u
17 u = 34
1 u = 34 ÷ 17 = 2
Cost of 1 sticker
= 1 u
= $2
(b)
Cost of 1 marble
= 4 u
= 4 x 2
= $8
(c)
Cost of 3 marbles and 4 stickers
= 3 x 4 u + 4 x 1 u
= 12 u + 4 u
= 16 u
= 16 x 2
= $32
Answer(s): (a) $2; (b) $8; (c) $32