Adam pays $1.60 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 = 1.60
1 u = 1.60 ÷ 8 = 0.20
Cost of the sticker
= 7 u
= 7 x 0.20
= $1.40
(b)
Cost of 4 marbles and 5 stickers
= 4 x 1 u + 5 x 7 u
= 4 u + 35 u
= 39 u
= 39 x 0.20
= $7.80
Answer(s): (a) $1.40; (b) $7.80