ANSWER
520 pints = 0.89 barrels
Step-by-step explanation
First we have to know how many quarts are 520 pints. If 2 pints equals to one quart, then:
Now we have to transform this to gallons. If 4 quarts is 1 gallon, then:
And finally tranform from gallons to barrels. If 73 gallons is one barrel, then: