In which direction should the missing arrow point?

Find the value of "a" by solving the maths equation in the picture below:

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

Rearrange the letters in "new door" to make one word.

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?

Aman has 1.15 rupees in his pocket. There are a total of 6 coins in his pocket.

When his friend asked him for a change, he could not give change for a rupee and five paisa.

Can you tell which coins he has?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

What has many keys but can’t open a single lock?