If the 3rd day of a month is Thursday, what day will the 20th day of that month be?

Question: If the 3rd day of a month is Thursday, what day will the 20th day of that month be?

Solution:
If the 3rd day of the month is Thursday. then,
3 + 7 = 10th day,
10 + 7 = 17th day,
17 + 7 =24th day
Will also be Thursdays.

Now, 20 - 17 = 3
So, the 20th day is 3 days after Thursday.
Thursday + 3 days = Sunday.

Therefore, if the 3rd day of the month is Thursday, the 20th day will be Sunday.