Who always enjoys poor health?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

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 make a six-letter word using the letters N, A and B ?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

What you cannot hold but it is yours?

Count the number of triangles in the below picture?

The husband and wife were jogging in the morning. To match every two steps of the husband, the wife required three steps. If Both of them start with the here right foot. After how many steps do their left foot be together?