Adam pays $4.80 for a sticker and a marble.
The sticker costs 7 times as much as the marble.
- What is the cost of 1 sticker?
- How much is the cost of 4 marbles and 5 stickers?
(a)
Cost of a marble = 1 u
Cost of a sticker = 7 u
Total cost of a marble and a sticker
= 1 u + 7 u
= 8 u
8 u = 4.80
1 u = 4.80 ÷ 8 = 0.60
Cost of the sticker
= 7 u
= 7 x 0.60
= $4.20
(b)
Cost of 4 marbles and 5 stickers
= 4 x 1 u + 5 x 7 u
= 4 u + 35 u
= 39 u
= 39 x 0.60
= $23.40
Answer(s): (a) $4.20; (b) $23.40