In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

What makes this number unique: 8,549,176,320?

What does below pictogram mean?

When is the top of a mountain similar to a savings account?

Move three sticks of the spiral below to form a square.

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

John is the son of Jacob.
So,
Jacob is the_____of John's father?