Adam pays $2.80 for a sticker and a marble.
The sticker costs 6 times as much as the marble.
- What is the cost of 1 sticker?
- How much is the cost of 5 marbles and 3 stickers?
(a)
Cost of a marble = 1 u
Cost of a sticker = 6 u
Total cost of a marble and a sticker
= 1 u + 6 u
= 7 u
7 u = 2.80
1 u = 2.80 ÷ 7 = 0.40
Cost of the sticker
= 6 u
= 6 x 0.40
= $2.40
(b)
Cost of 5 marbles and 3 stickers
= 5 x 1 u + 3 x 6 u
= 5 u + 18 u
= 23 u
= 23 x 0.40
= $9.20
Answer(s): (a) $2.40; (b) $9.20