What is 3 multiplied by the first common multiple of 3 and 6?

Sure, here are the steps to solve the problem:

1. First, we need to find the common multiples of 3 and 6. The multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, etc. The multiples of 6 are 6, 12, 18, 24, 30, etc.

2. The first common multiple of 3 and 6 is 6.

3. Then, we multiply this common multiple (6) by 3.

4. The result is 18.

So, 3 multiplied by the first common multiple of 3 and 6 is 18.