Adam has some money to buy some stickers.
If he buys 9 stickers, he will have $20 left.
If he buys 19 stickers, he will have $10 left.
- How much does each sticker cost?
- How much money does he have?
(a)
Difference in the number of stickers in both scenarios
= 19 - 9
= 10
Difference in the amount to pay in both scenarios
= 20 - 10
= 10
Adam needs $10 to buy 10 extra stickers.
Cost of 10 stickers = $10
Cost of 1 sticker = 10 ÷ 10 = $1
(b)
Amount that he has
= Cost of 9 stickers + 20
= 9 x 1 + 20
= 9 + 20
= $29
Answer(s): (a) $1; (b) $29