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

### Instruction:
Class A is twice as big as Class B. Class A is also a third the size of Class C. If Class B has 20 people in it, how many people are in Class C?

### Response:
Class A is 2*20=<<2*20=40>>40 people.
Class C is 40*3=<<40*3=120>>120 people.
#### 120