Adam pays $3.00 for a sticker and a marble.
The sticker costs 9 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 = 9 u
Total cost of a marble and a sticker
= 1 u + 9 u
= 10 u
10 u = 3.00
1 u = 3.00 ÷ 10 = 0.30
Cost of the sticker
= 9 u
= 9 x 0.30
= $2.70
(b)
Cost of 5 marbles and 3 stickers
= 5 x 1 u + 3 x 9 u
= 5 u + 27 u
= 32 u
= 32 x 0.30
= $9.60
Answer(s): (a) $2.70; (b) $9.60