Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

Can you count the number of squares in the given picture?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

Count the number of lines in the image below ?

What does the below rebus riddle means?

Find out the number of circles in the given picture having Illusion

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

What does this Rebus Picture means ?