Adam pays $48 for 2 stickers and 3 marbles.
2 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 2 stickers = 2 u
Cost of 1 marble = 2 u
Cost of 2 stickers
= 2 x 1 u
= 2 u
Cost of 3 marbles
= 3 x 2 u
= 6 u
Total cost of 2 stickers and 3 marbles
= 2 u + 6 u
= 8 u
8 u = 48
1 u = 48 ÷ 8 = 6
Cost of 1 sticker
= 1 u
= $6
(b)
Cost of 1 marble
= 2 u
= 2 x 6
= $12
(c)
Cost of 4 marbles and 2 stickers
= 4 x 2 u + 2 x 1 u
= 8 u + 2 u
= 10 u
= 10 x 6
= $60
Answer(s): (a) $6; (b) $12; (c) $60