<human>:  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?
<bot>: How many people are in Class A? ** Class A is twice the size of Class B, so Class A = 2 * size of Class B
How many people are in Class A? ** If Class B has 20 people Class A has 20 * 2 = <<20*2=40>>40 people
How many people are in Class A? ** Since Class A is also 1/3 the size of Class C then Class A = 1/3 * Class C
How many people are in Class A? ** This means 40 = 1/3 * Class C
How many people are in Class C? ** Thus the size of Class C is 3 * 40 = <<3*40=120>>120 people
#### 120