Adam pays $2.70 for a sticker and a marble.
The sticker costs 2 times as much as the marble.
- What is the cost of 1 sticker?
- How much is the cost of 5 marbles and 4 stickers?
(a)
Cost of a marble = 1 u
Cost of a sticker = 2 u
Total cost of a marble and a sticker
= 1 u + 2 u
= 3 u
3 u = 2.70
1 u = 2.70 ÷ 3 = 0.90
Cost of the sticker
= 2 u
= 2 x 0.90
= $1.80
(b)
Cost of 5 marbles and 4 stickers
= 5 x 1 u + 4 x 2 u
= 5 u + 8 u
= 13 u
= 13 x 0.90
= $11.70
Answer(s): (a) $1.80; (b) $11.70