A vat that have a cap to hold 45 quarts, and each bottle contains 9/21 quarts, how many bottles can be fill 45 quarts.
bottles = qts / (qts/bottle)
b = 45q/(9/21 q/b)
= 45q * 21/9 b/q = 105 bottles
b = 45q/(9/21 q/b)
= 45q * 21/9 b/q = 105 bottles