Solution:

32 Degrees Fahrenheit at which Water Freezes.

Solution:

Rajesh will love villages but he will hate towns.

This is because he only likes things that contain double letters in their spelling.
The words balloons, swimming and weeds have double letters. Even villages has double letters and thus he will love villages.

Solution:

HEAVEN

Explanation:
ENEMY = 4 + 3 + 4 + 4 + 3 = 18
LINK = 2 + 1 + 3 + 3 = 9
HELL = 3 + 4 + 2 + 2 = 11
TAXI = 2 + 3 + 2 + 1 = 8
HEAVEN = 3 + 4 + 3 + 2 + 4 + 3 = 19

Using the same trick,
TAXI + HELL = 8 + 11 = 19 = HEAVEN.

Therefore, the required answer is HEAVEN.

Solution:

24

For Explanation : check picture solution.

Solution:

Both of them were able to cross the river because they were standing on the opposite sides of the river.

Solution:

The man is 84 years old.
The son is 49 years old.
The grandson is 7 years old.

Solution:

9

Explanation:
5 cartons for large boxes = 5 * 6 = 30 boxes
4 cartons for small boxes = 4 * 9 = 36 boxes

He will need 9 cartons to place 66 boxes.

Solution:

Yes, this is possible. The doctor is the wife and the mother.

Solution:

The murderer is Soumya because 26 Jan is a national holiday in India and the municipality office remains closed.

Solution:

The South-East direction gets changed to North.

This is because by changing North-East into west, we are actually rotating the entire direction plane 135 degrees anticlockwise.