Adam pays $36 for 6 marbles and 2 stickers.
3 marbles cost as much as 1 sticker.
- How much is 1 marble?
- How much is 1 sticker?
- How much is 5 stickers and 3 marbles?
(a)
Choose the smaller group to be 1 u.
Cost of 1 marble = 1 u
Cost of 3 marbles = 3 u
Cost of 1 sticker = 3 u
Cost of 6 marbles
= 6 x 1 u
= 6 u
Cost of 2 stickers
= 2 x 3 u
= 6 u
Total cost of 6 marbles and 2 stickers
= 6 u + 6 u
= 12 u
12 u = 36
1 u = 36 ÷ 12 = 3
Cost of 1 marble
= 1 u
= $3
(b)
Cost of 1 sticker
= 3 u
= 3 x 3
= $9
(c)
Cost of 5 stickers and 3 marbles
= 5 x 3 u + 3 x 1 u
= 15 u + 3 u
= 18 u
= 18 x 3
= $54
Answer(s): (a) $3; (b) $9; (c) $54
