<human>:  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?
<bot>: How many blue fish are there? ** There are 2*10=<<2*10=20>>20 blue fish.
How many fish are there? ** There are 3*20=<<3*20=60>>60 fish.
#### 60