How many 9's are followed by and preceded by numbers divisible by 2?
8965359683496526973729413794173498453976153195742968532957489451

According to question,
Days by Mohan, [17th, 18th or 19th] January
Days by sister, [19th, 20th, 21st or 22nd] January.
Required days is 19th January as it is common in both the groups.

According to above question,
Days by Rajat, June 18 or earlier.
Days by his sister, June 18 or June 19.
Clearly, June 18 is the required day.

Days by Pratap - [20,21 or 22] in April
Days by his sister, not on or after 22 April
Clearly, the answer is [20 or 21] in April.

According to question,
Samant remembers that his brother's birthday is after 16th but before 20th of January
it means birthday will be on of any one date
17th, 18th, 19th January.
According to his sister remembers that her brother's birthday is after 17th but before 19th of January.
it means birthday will be on
18th January.
Her brother's birth day is on 18th of January as 18th January is common to both the groups of dates.

Days by Sameer [16,17],in February
Days by Kanika [17,18] in February
17th February is common in both the groups.
Cleary, the correct date is 17th February.

Total number of boys = (10 + 27 - 1)
    = 37 - 1 = 36
So, Rajan's position from the right
= (36 - 10) + 1 = 26 + 1 = 27

When Rahul was shifted by three places towards his right side, then he occupies the middle position, i.e., 13th position.

Ascending order 1 2 3 4 5 7 8 9
? Required difference = 5 - 3 = 2

After interchanging the first and the last digit, numbers are 984, 145, 456, 359, 387
Hence, second highest number = 456 means 654.

Arranging all the digits in ascending order, we get
489, 145, 456, 359, 378
Hence , lowest number = 145 ? 541