12 pints of soapy water.
8 pints = 1 gallon.
1 pint = 1/8 gallon
12 pints = 12*(1/8)
12 pints = (12/8) gallons
= 3/2 = 1.5 gallons.
Since the bucket is 5 gallon capacity, It can hold:
5 - 1.5
= 3.5 gallons more.
But 1 gallon is = 4 quarts.
3.5 gallons = 3.5 * 4 = 14 quarts more.