Jenny goes to the florist to buy some flowers. Roses cost $2 each and $15 for a dozen. If she bought 15 roses and arrived with five 5 dollar bills and they only have quarters for change, how many quarters does she leave with?
Jenny has $25 because 5 x 5 = 25
She buys 1 dozen roses and 3 single roses because 15 - 12 - 3 = 0
She spends $6 on the single roses because 3 x 2 = 6
She spends $21 on roses because 15 + 6 = 21
She gets $4 in change because 25 - 21 = 4
She gets 16 quarters because 4 x 4 = 16