What is the next number in this series?

4,12,84,3612....

What question can you never answer yes to?

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?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Find The Odd One Out

1. FLOW
2. SNIP
3. TRAP
4. DRAW
5. BACK

Replace the question mark in the picture below.

Which number comes next in the number series?

2, 9, 30, 93, ?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?