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 the missing number in the image below.

An apple seller is hosting a competition. He offers 1000 apples and 10 boxes to the people who pass by. The challenge is to put those 1000 apples in the 10 boxes in such a manner that if he asks for any amount of apples, the person can directly give him the boxes or a combination of boxes. If the person can do it, he promises to give a thousand apples for free.

If you happen to pass by the apple seller, will you be able to win a thousand apples?

Forwards I am heavy, backward I am not. What am I?

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

Find the hidden panda in the image below.

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

I always drive my customer away.

Who am I?

What number should come in place of the question mark below?