Can you solve below mathematical equation?

2^1234 - 2^1233

Find the next number in the series below

21 32 54 87 131 ?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

Be active and find the killer in the picture Riddle below.

What does the below rebus puzzle mean?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?