Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

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

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

If 21x = 79x, what is the value of x?

Spot what is wrong here in below Picture?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

I got a bee but no honey.
got an eye but am still blind.
got a sea but no water.
got a tea but no coffee.
got a why but no answer.

What Am I?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?