How is the moon similar to a dollar?

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

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

Why is the Hole below a Lock?

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.

I have Rs.50 and I spend it in the way as below.

How many triangles are there on the puzzle below?