Weekly Challenge #6

One day early;)

Weekly Challenge #6 (week of July 11th)
Brain Teaser II

1. How many of each species did Moses take onto the ark with him?
   


2. If 3 cats catch 3 rats in 3 minutes, how many minutes will it take 100 cats to catch 100 rats?
   


3. I am very heavy, but backwards I'm not.