Question

Shelby made 5 quarts of juice for a picnic .She said that she made1 1/4 of juice/Explain Shelby's mistake

Answer 1

1 gallon= 4 quarts 

She made 5 quarts of juice, that means that she has 1 gallon (4 quarts) and one quart left over!
which can be written as 1 1/4!

Answer 2

Shelby's mistake is that she didn't label the juice correctly.

1 gallon is 4 quarts.

Therefore, you would say 1.2 gal.