Recent Riddles & Brain Teasers

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

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

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

The more you take me, the more you leave me behind.
Who Am I?