Adam pays $20 for 2 stickers and 4 marbles.
2 stickers cost as much as 1 marble.
- 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 1 sticker = 1 u
Cost of 2 stickers = 2 u
Cost of 1 marble = 2 u
Cost of 2 stickers
= 2 x 1 u
= 2 u
Cost of 4 marbles
= 4 x 2 u
= 8 u
Total cost of 2 stickers and 4 marbles
= 2 u + 8 u
= 10 u
10 u = 20
1 u = 20 ÷ 10 = 2
Cost of 1 sticker
= 1 u
= $2
(b)
Cost of 1 marble
= 2 u
= 2 x 2
= $4
(c)
Cost of 2 marbles and 5 stickers
= 2 x 2 u + 5 x 1 u
= 4 u + 5 u
= 9 u
= 9 x 2
= $18
Answer(s): (a) $2; (b) $4; (c) $18
