Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
There are 30 fish in the tank. One third of them are blue, and half of the blue fish have spots. How many fish in the tank are blue, spotted fish?

### Response:
One third of the 30 fish are blue, so 30/3 = <<30/3=10>>10 fish are blue.
Half of the blue fish have spots, so 10/2 = <<10/2=5>>5 fish are blue, spotted fish.
#### 5

