Adam pays $2.80 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 5 stickers and 2 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 = 2.80
1 u = 2.80 ÷ 7 = 0.40
Cost of the marble
= 6 u
= 6 x 0.40
= $2.40
(b)
Cost of 5 stickers and 2 marbles
= 5 x 1 u + 2 x 6 u
= 5 u + 12 u
= 17 u
= 17 x 0.40
= $6.80
Answer(s): (a) $2.40; (b) $6.80