Which country gets ill every time?

If 21x = 79x, what is the value of x?

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?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Replace the question mark with the correct number in the below-given picture?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

I shave every day, but my beard stays the same. What am I?

Solve the following series:
AZ, GT, MN, __, YB

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

how come the second man dies?