What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?

A rain drop fell from one leaf to another leaf and lost 1/4th of its volume. It then fell to another leaf and lost 1/5th of the volume. It again fell on another leaf and lost 1/5th of the volume.



This process kept repeating till it fell on the last leaf losing 1/75th of its volume.



Can you calculate the total percentage of loss from the initial volume when the drop has fallen to the last leaf accurate up to two decimal places?

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?

If 1+9+8=1, what is 2+8+9?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Find the value of "?" in the ball picture Riddle below:

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

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

Which is heavier: a ton of bricks or a ton of feathers?