What has many keys but can’t open a single lock?

I can be made.
I can be cracked.
I can be told.
I can be played.

Who am I?

In which direction should the missing arrow point?

In a school, 280 students studied chemistry, 254 students studied physics and 280 students studied biology.

97 students studied chemistry as well as physics, 138 students studied physics as well as biology and 152 students studied chemistry as well as biology.

73 students studied all the three branches.

Can you find out the total number of students?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Through your logical capabilities, can you make 7 an even?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

There was a blind beggar living on the footpath of a street. Suddenly one day, the beggar's brother died. What was the relation of the blind beggar with the person who died?

PS: Brother is not the answer.

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?