Adam pays $1.40 for a marble and a sticker.
The marble costs 6 times as much as the sticker.
- What is the cost of 1 marble?
- How much is the cost of 2 stickers and 4 marbles?
(a)
Cost of a sticker = 1 u
Cost of a marble = 6 u
Total cost of a sticker and a marble
= 1 u + 6 u
= 7 u
7 u = 1.40
1 u = 1.40 ÷ 7 = 0.20
Cost of the marble
= 6 u
= 6 x 0.20
= $1.20
(b)
Cost of 2 stickers and 4 marbles
= 2 x 1 u + 4 x 6 u
= 2 u + 24 u
= 26 u
= 26 x 0.20
= $5.20
Answer(s): (a) $1.20; (b) $5.20