# three-tenths of an ephah

"six liters" or "three-tenths of an ephah (which is about six liters)". "Three-tenths" means three parts out of ten equal parts.  

# mixed with oil

"which you have mixed with oil"

# two-tenths of fine flour

"four and a half liters of fine flour" or "two-tenths of an ephah (which is about 4.5 liters) of fine flour"