Can you replace the question mark with the correct number in the below table sequence?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

If an electric train is travelling south, then which way is the smoke going?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

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?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?