Before Mount Everest was discovered, what was the highest mountain in the world?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

I am the fastest animal but cannot climb the tree. What am I?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

what does this picture(rebus) riddle means ?

Find the missing letter in the last circle logically in the given below picture.

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

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

If eleven plus two equals one, what does nine plus five equal?