Juanita is watering her lawn using the water stored in her rainwater tank the water in the tank drops 1/3 inch every 10 minutes she waters. If the tanks water level is 4 feet how many days can Juanita water if she waters for 15 minutes each day?

Juanita is watering her lawn using the water that is stored by rainwater.

=> the water in the tank drops 1/3 inch in every 10 minutes she waters.

=> The tanks water level is 4 feet.

Question : Number of days can Juanita waters is she waters 15 minutes per day.

=> 4 feet is the total amount of water = 1 ft = 12 inches

=> 48 inches in total

=> 1/3 inch is used every 10 minutes = 0.33 inches

=> she waters 15 minutes per day = 0.495 inches in every 15 minutes

Solution

=> 48 inches / 0.495 inches per day

=> 96.97

So Juanita can use all the water in water tank for approximately 97 days.

The person before me rounded a bit, and i personally do not like it. If there is 4 feet, that is 48 inches. If ten minutes is a third of an inch, then 30 minutes is one inch. So 15 minutes is half an inch. If you use the water for 15 minutes (or half an inch a day) then you have 96 days exactly.