Solution:

The blazer from man3 is on the boss's chair. So he is the boss.

Solution:

Girl 3

Our feet usually and unconsciously point toward the one with who we are most interested.

Solution:

No shadows.

Solution:

The Letter L

Solution:

Teapot B contains 20 cups of tea as its outlet is placed in the middle of teapot A. Rest of the
tea just starts overflowing.

Solution:

In a clock.

Explanation:
1300 + 20 = 1:00PM + 20 minutes = 1:20 PM

1400 - 40 = 2:00PM - 40 minutes = 1:20 PM

Solution:

The Waiter

Holding a tray is a static job while serving dishes and drinks is their main work and hence the waiter is most likely the left-handed person.

Solution:

It can be done as shown below.

Solution:

Sunday

Explanation:
Since each day of the week is repeated after 7 days.
So, after 77 days, it will be Tuesday.
Therefore, After 75 days, it will be Sunday.

Solution:

Cup-8

Explanation:
This might be tricky for mobile users where the bottom cup is difficult to focus on.