Adam pays $26 for 3 stickers and 2 marbles.
5 stickers cost as much as 1 marble.
- How much is 1 sticker?
- How much is 1 marble?
- How much is 5 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 3 stickers
= 3 x 1 u
= 3 u
Cost of 2 marbles
= 2 x 5 u
= 10 u
Total cost of 3 stickers and 2 marbles
= 3 u + 10 u
= 13 u
13 u = 26
1 u = 26 ÷ 13 = 2
Cost of 1 sticker
= 1 u
= $2
(b)
Cost of 1 marble
= 5 u
= 5 x 2
= $10
(c)
Cost of 5 marbles and 2 stickers
= 5 x 5 u + 2 x 1 u
= 25 u + 2 u
= 27 u
= 27 x 2
= $54
Answer(s): (a) $2; (b) $10; (c) $54
