Can you replace the question mark with the correct number?

Can you find the thief by just looking at the picture below?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

I taste better than I can smell. Who am I?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
S O L E S
=========
T O W E L
=========

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What month of the year has 28 days?