"Two-tenths" means two parts out of ten equal parts. This can be written in modern measurements. Alternate translation: "four and a half liters" or "two tenths of an ephah (which is about 4.5 liters)" (See: [[rc://en/ta/man/translate/translate-fraction]] and [[rc://en/ta/man/translate/translate-bvolume]])
Many offerings had a drink offering that was required to be offered with them. The full meaning of the can be made clear. Alternate translation: "the drink offering that accompanies it" (See: [[rc://en/ta/man/translate/figs-explicit]])