2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

I travel all around the world but always stay in the corner. What am I?

Can you find the 09 errors in the picture below?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

What is at the end of a rainbow?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?