PLEASE HELP MEE!! I WILL GIVE BRAINLIEST TO AN ACCURATE EXPLANATION! (Look at the picture)

Answer:
6 gallons 54 fish
Step-by-step explanation:
is she has 12 gallons and in 2 minutes its gone at a steady rate then just divide 12 by 2 so 6 every minute
just 3 multiplied by 18 since hes adding 3 fish every day for 18 days so you could just do 3+3+3+3 for 18 or simpler 3x18
hope this helped