There are 2*10=<<2*10=20>>20 blue fish.

There are 3*20=<<3*20=60>>60 fish.

# Answer

60
Question:
There are many fish in the tank. One third of them are blue, and half of the blue fish have spots. If there are 10 blue, spotted fish, how many fish are there in the tank?
Answer:
Let's think step by step.

user
60
There are many fish in the tank. One third of them are blue, and half of the blue fish have spots. If there are 10 blue, spotted fish, how many fish are there in the tank?
train