A jug is half filled with juice. Berna fills this juice into 15 glasses with a capacity of 3/5 liters. There is 1/4 of the juice left in the jug. Accordingly, how many cups will be needed if the entire jug is filled with glasses with a capacity of 1/4 liters?
a. 5
b. 10
c. 15
d. 20
