Charlie has some money to buy some stickers.
If he buys 3 stickers, he will have $21 left.
If he buys 12 stickers, he will have $12 left.
- How much does each sticker cost?
- How much money does he have?
(a)
Difference in the number of stickers in both scenarios
= 12 - 3
= 9
Difference in the amount to pay in both scenarios
= 21 - 12
= 9
Charlie needs $9 to buy 9 extra stickers.
Cost of 9 stickers = $9
Cost of 1 sticker = 9 ÷ 9 = $1
(b)
Amount that he has
= Cost of 3 stickers + 21
= 3 x 1 + 21
= 3 + 21
= $24
Answer(s): (a) $1; (b) $24