Adam pays $4.00 for a marble and a sticker.
The marble costs 9 times as much as the sticker.
- What is the cost of 1 marble?
- How much is the cost of 5 stickers and 2 marbles?
(a)
Cost of a sticker = 1 u
Cost of a marble = 9 u
Total cost of a sticker and a marble
= 1 u + 9 u
= 10 u
10 u = 4.00
1 u = 4.00 ÷ 10 = 0.40
Cost of the marble
= 9 u
= 9 x 0.40
= $3.60
(b)
Cost of 5 stickers and 2 marbles
= 5 x 1 u + 2 x 9 u
= 5 u + 18 u
= 23 u
= 23 x 0.40
= $9.20
Answer(s): (a) $3.60; (b) $9.20