A desert garden's sprinkler system runs twice a day during the cool morning and evening hours. It waters the garden with four liters of water in the morning and six liters in the evening. How many days does it take the sprinkler system to use 50 liters of water?
Thoughts? Step-by-step reasoning:
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.