Adam pays $2.40 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 2 marbles and 5 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 = 2.40
1 u = 2.40 ÷ 3 = 0.80
Cost of the sticker
= 2 u
= 2 x 0.80
= $1.60
(b)
Cost of 2 marbles and 5 stickers
= 2 x 1 u + 5 x 2 u
= 2 u + 10 u
= 12 u
= 12 x 0.80
= $9.60
Answer(s): (a) $1.60; (b) $9.60