Why 1729 is a magic number? Answer Logically.

what does the below rebus means?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

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

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

What kind of band never plays music?