Praveen correctly remembers that his father's birthday is after 21th May but before 27th May whereas his sister correctly remembers that their father's birthday is after 24th May but before 30th May. On which day in May was definitely their father's birthday?

According to        Birth Date
Samant                 16, 17
Sister                     17, 18
Here, 17th is common to both,
Hence, confirm data is 17th February.

As 1st October is a Sunday. So, 29th October is also a Sunday. Now, 31st October is Tuesday. Hence, 1st November will be Wednesday.

If the 5th day of the month is Tuesday. Then, first day of the month will be Friday. The third Friday will fall on 15th of the month. So, the date 3 days after 3rd Friday will be 19th.

Arrangement in descending order,
Krishna > Guru > Raghu > Raja
Hence, Krishna is the fastest from all of them.

According to question,
A's weight is twice as much as of B.
1. A = 2B.
B's weight is four and half times as much as of C.
2. B = 4.5C
C's weight is half times as much as of D.
3. C = D/2.
D's weight is half as much as of E.
4. D = E/2.
E weight is less than A but more than C.
5. A > E > C

from 1 and 2
6. A = 2B = 9C
from 6 and 3
7. A = 2B = 9C = 4.5D
from 7 and 4
8. A = 2B = 9C = 4.5D = 2.25E
so from 8 and 5
A > B > E > D > C

So lightest in weight is C.

According to      Birth Date
Sangeeta           9, 10, 11, 12
Natasha           10, 11, 12, 13
Hero, 10, 11 and 12 three dates are common.
So, confirm date cannot be datermined.

According to               Birth Date
Sneha                           12, 13, 14 15
Younger Brother       14, 15, 16, 17
Elder Brother         . . . , 14, 16, . . .
Hence, confirm date is fourteenth.

Arranging all birds in descending order according to distance,
Little pigeon > Crow > Pigeon > Big crow > Eagle.
Hence, Eagle is the last.

5 3 1 6 9 7
|    |    |
Perfect square = 576
Square root = ?576 = 24
Hence, second digit = 4

Dhanbad > Palamu > Para Banki > Fatehpur > Akbarpur. Hence, Dhanbad district is biggest amongst them