If the 3rd day of a month is Monday, which one of the following will be the fifth day from 21st of this month?

1. **Identify the pattern:** The problem is about finding a day of the week, which repeats every 7 days.\n\n2. **Establish the Anchor:** We are given that the **3rd** is a **Monday**.\n\n3. **Jump closer to the target:** We need to reach the end of the month. Since days repeat every 7 days, adding 21 days (which is $7 \\times 3$) to the 3rd will land us on the same day of the week.\n $$3 + 21 = 24$$\n So, the **24th is also a Monday**.\n\n4. **Define the Target:** The question asks for the 'fifth day from 21st'.\n $$21 + 5 = 26$$\n So our target date is the **26th**.\n\n5. **Final Step:** We know the 24th is Monday. The 26th is just 2 days later.\n $$Monday + 2 days = Wednesday$$\n\nThis method is faster than calculating the day for the 21st first.