 
<translate> Kwa ụbọchị, onye na-agba mmiri na-eji 4 + 6 = 10 lita mmiri eme ihe. N'ihi ya, ọ na-ewe ihe dị ka ụbọchị 50 / 10 = ụbọchị 5 iji jiri mmiri ruru lita 50 mee ihe. N'ihi ya, azịza ya bụ 5. <eng> Every day, the sprinkler uses 4 + 6 = 10 liters of water. Hence, it takes the sprinkler system 50 / 10 = 5 days to use 50 liters of water.
Thus, the answer is 5. 