What does below Rebus mean ?

esgg sgeg gegs gsge

Replace the question mark with the number below given a simple math problem.

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 ?

What is the next number in this series?

4,12,84,3612....

Which Travels Faster? Solve below famous picture riddle:

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

81 x 9 = 801. What must you do to make the this equation true?