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?

What breaks yet never falls, and what falls yet never breaks?

How can you make number one disappear by adding something to it?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Forwards I am heavy, backward I am not. What am I?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Can you solve the below rebus?