Adam has some money to buy some stickers.
If he buys 9 stickers, he will have $10 left.
If he buys 12 stickers, he will need $11 more.
- How much does each sticker cost?
- How much money does he have?
(a)
Difference in the number of stickers in both scenarios
= 12 - 9
= 3
To buy 3 stickers, he needs to use $10 that is left and get an extra of $11.
Difference in the amount to pay in both scenarios
= 10 + 11
= $21
Adam needs $21 to buy 3 extra stickers .
Cost of 3 stickers = $21
Cost of 1 sticker = 21 ÷ 3 = $7
(b)
Amount that he has
= Cost of 9 stickers + 10
= 9 x 7 + 10
= 63 + 10
= $73
Answer(s): (a) $7; (b) $73