First, let's determine how many units of raw material B are required for one day of production:

Units of raw material B per day = Units of product A per day * Units of raw material B per unit of product A
                                 = 500 * 3
                                 = 1500

Now, let's calculate how many units of raw material B are needed for 45 days of production:

Units of raw material B for 45 days = Units of raw material B per day * Number of days
                                    = 1500 * 45
                                    = 67,500

So, 67,500 units of raw material B are required for 45 days of production.
A factory produces 500 units of product A every day. Each unit of product A requires 3 units of raw material B. How many units of raw material B are required for 45 days of production?