Calendar – Railway Reasoning

Total number of days between 19ᵗʰ July 2019 and 21ᵗʰ September 2019 = 12 + 31 + 21 ⇒ 64
Total odd remaining days = 64/7 ⇒ 1
Hence, friday + 1 = Saturday

Total number of days between 3ʳᵈ
February 2015 and 6ᵗʰ June 2015
= 25 + 31 + 30 + 31 + 6 = 123 days
Total odd remaining days = 123/7 ⇒ 4
Hence, ? = Tuesday + 4 = Saturday

Total number of days between 12ᵗʰ August and 26ᵗʰ September in the same year
= 19 + 26 = 45 days
So total odd remaining days =  45/7 ⇒ 3
Hence, ? = Monday + 3 = Thursday

Total number of day between 12 July 1965 and 14 August 1966
= 365 + 19 + 14 = 398 days
Total remaining odd days = 398/7 = 6
? = Monday + 6 = Sunday

Total number of day between 1 August 2021 and 1 November 2021
= 30 + 30 + 31 + 1 = 92 days
Total remaining odd days = 92/7 = 1
? = Sunday + 1 = Monday

Total number of days between
21ᵗʰ march 2021 and 12ᵗʰ january 2022
= 365 + 12 - (21 + 28 + 31)
= 377 - 80 ⇒ 297
Total number of odd days = 297/7,  remaining = 3
? = Sunday + 3 = Wednesday

Here as the date and month are the same for both cases i.e. october 12, So, we will only have to find the numbers of odd days in the years from 1997 to 2008.
The total number of odd days =14,
If divided by 7 remainder will be = 0
So, 12 October 2008 was = (Saturday + 0) = Saturday.

Feb = 13 days
March = 31 days
April = 27 days
Total days = 13 + 31 + 27 = 71 days

Number of days between 15 March 2015 and 10 july 2015
= 16 + 30 + 31 + 30 + 10 = 117
When we divide 117 by 7 get remainder = 5
Mondays + 5 days = Saturday

Total days from 4th march 2018 to 7 march 2019 = 365 + 3 = 368 days When we divide 368 by 7 we get 4 as remainder
Wednesday + 4 day = Sunday