Liters is a big measurement of a liquids weight which means it cant be price or length. got that? so the weight of a goldfish probably isn't even big enough to be weighed in pounds so the answer is amount of water in an aquarium.
You would have one tenths (1/10) of a chance to get a 4 on the first go. you would have four ninths (4/9) of a chance to get a number less than 5 out of the bag on the second go.
the overall probability would be two forty-fifths (2/45)
