Adam pays $30 for 4 marbles and 3 stickers.
2 marbles cost as much as 1 sticker.
- How much is 1 marble?
- How much is 1 sticker?
- How much is 3 stickers and 2 marbles?
(a)
Choose the smaller group to be 1 u.
Cost of 1 marble = 1 u
Cost of 2 marbles = 2 u
Cost of 1 sticker = 2 u
Cost of 4 marbles
= 4 x 1 u
= 4 u
Cost of 3 stickers
= 3 x 2 u
= 6 u
Total cost of 4 marbles and 3 stickers
= 4 u + 6 u
= 10 u
10 u = 30
1 u = 30 ÷ 10 = 3
Cost of 1 marble
= 1 u
= $3
(b)
Cost of 1 sticker
= 2 u
= 2 x 3
= $6
(c)
Cost of 3 stickers and 2 marbles
= 3 x 2 u + 2 x 1 u
= 6 u + 2 u
= 8 u
= 8 x 3
= $24
Answer(s): (a) $3; (b) $6; (c) $24
