Charlie has some money to buy 10 stickers
but he buys only 3 stickers and has $21 left.
- How much does each sticker cost?
- How much money does he have?
(a)
Number of stickers that Charlie has not bought
= 10 - 3
= 7
Cost of 7 stickers = $21
Cost of 1 sticker = 21 ÷ 7 = $3
(b)
Amount that Charlie has
= Cost of 10 stickers
= 10 x 3
= $30
Answer(s): (a) $3; (b) $30