Question

An automatic sprinkler system uses 2 gallons of water in one minute. How long will it take for the system to use 21 gallons of water

Answer 1

Explanation:

Step 1:

Time it takes to use 2 gallons - 1 min

Step 2:

Time it takes to use 1 gallon - 1/2 min

Step 3:

Time it takes to use 21 gallons - (1/2) . 21 min

10.5 min

Answer: 10.5 min