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?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Can you tell a 3D object that has just two surfaces?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

During which month do people sleep the least?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Can you place six X (crosses) in below board without making three in a row in any way ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I am an odd number. Take away a letter and I become even. What number am I?