Solution:

The given words can be formed into the following words:
Recalculate
Hairball (or airbag)
Hydrolysis
Antibacterial
Guideline
Algorithm
Microscope
Keyhole

Solution:

Bond was suspicious of the women as one never knocks its own door at the hotel.

Solution:

Can be found on the pic below.

Solution:

Rhea will open just one present.
Cindy|Y - Y is the 25th alphabet
Duk|E - E is the 5th alphabet
Joh|N - N is the fifteenth alphabet
Rhe|A - A is the first alphabet

Solution:

457730 * 4 = 1830920
(DOLLAR * 4 = QUARTER)

Solution:

The husband had booked two tickets for departure and only one for the return. The travel agent told this information to the police and they immediately came to know that he had planned the murder right from the beginning.

Solution:

Four

As the window was closed it is obvious that the six candles that were not extinguished were lit till they melted away entirely. Thus only four candles that were extinguished remain at the end.

Solution:

The probability of two numbers being relatively prime is 60%. Thus if you keep playing the bet, you will hypothetically make 20 cents on every play.

Thus, you should accept the bet.

Solution:

7 Races.

Solution:

Playing chess

Game needs two players so Brother-8 is playing chess with Brother-2

Solution:

The mules is moving in circular path and hence outside legs travels more distance than inner legs.