Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What is the centre of gravity?

A river should be crossed by a father, a mother and their two sons and two daughters.
There are some rules that should be followed while crossing the river. There can be only two people in the raft while crossing. The daughters cannot be with their father unless there is the presence of the mother. The sons cannot be with their mothers unless the father is present. Unless the guard is on the board, the criminals cannot be with any of the family members. Only the adults like the father, the guard, and the mother knows to use the raft.

How will they cross the river?

I have teeth but i don't bite. Who Am I ?

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

I don't get anymore wetter, no matter how much rain falls on me.

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?