He is filling it at a rate of 6 gallon per minute
suppose it takes x minutes to reach 27 gallon
water filled in x minutes =
water already present + volume of water at the rate of 6 in x minutes
12 gallons + 6 gallon . minute 8 x minutes
12 + 6x
This should be equal to atleast 27
12+ 6x = 27
let us subtract 12 from both sides
6x = 27-12
6x = 15
divide both sides by 6
x= 2.5
Answer
It will take 2.5 minutes to reach 27 gallon .
When He start to fill the water
