Adam pays $3.60 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 3 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 = 3.60
1 u = 3.60 ÷ 3 = 1.20
Cost of the sticker
= 2 u
= 2 x 1.20
= $2.40
(b)
Cost of 3 marbles and 5 stickers
= 3 x 1 u + 5 x 2 u
= 3 u + 10 u
= 13 u
= 13 x 1.20
= $15.60
Answer(s): (a) $2.40; (b) $15.60