On 19th June, 1984 Monday falls. What day of the week was it on 19th June, 1985?

The 19th of June, 1985 was a Wednesday.

Here's the step by step process:

1. We know that 19th June, 1984 was a Monday.
2. A common year has 365 days, which can be divided by 7 (days of the week), leaving a remainder of 1. This means that the same date after one common year would shift one day of the week forward.
3. So, 19th June, 1985 would be one day ahead of Monday, which is Tuesday.
4. However, 1984 was a leap year, and 19th June comes after 29th February in 1984. This means we have one extra day to account for.
5. Therefore, 19th June, 1985 is two days ahead of Monday, which is Wednesday.