9
Three of them.
Five-sixths of a liter is twenty-twenty--fourths of a liter.
20
20
30
1/6 is equal to 6/36.
28 sixths
24 sixths
2 sixths = 1 third
20/24ths
5/6 liter + 20/4 liter = 5.833 liters.
It would be (5/6)/(50/4) = 0.0666... (repeating) of them.