Enrico's list includes all the multiples of 3 from $1 \cdot 3 = 3$ through $20 \cdot 3 = 60$. Marie's list includes all the multiples of 6 from $1 \cdot 6 = 6$ through $10 \cdot 6 = 60$. Since 6 is a multiple of 3, any multiple of 6 is also a multiple of 3. All of the numbers on Marie's list are multiples of 3 within the range of Enrico's list, so all $\boxed{10}$ numbers on Marie's list are also on Enrico's list.
Enrico makes a list of the first twenty positive multiples of 3. Marie makes a list of the first ten positive multiples of 6. How many of the numbers on Marie's list are also on Enrico's list?
{'answer': '10', 'subject': 'Prealgebra', 'level': 2, 'unique_id': 'test/prealgebra/195.json'}