Lazy Larry has a 65 gallon aquarium . It is recommended that he change 20 % of the water each week to keep the tank clean and his fish healthy . If he changed 15 gallons of water , what percentage of the water did he change ?

answer: plz give a pic and answer choices so i can answer!

step-by-step explanation:

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)

i dont know the answer but here's a picture of a dog