What does this Rebus Picture mean?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

In a fruit store, there was a unique weighing machine that was made to weigh only cherries and strawberries as they were priced the same.

Other fruits like watermelons or mango had different machines as they were expensive.

A man successfully buys watermelons at the price of cherries. How?

How many times can you subtract the number two from the number fifty?

What makes this number unique: 8,549,176,320?

Can you count the number of blocks in the picture below?

What is common among 11, 69, and 88?

An ape is trying to climb on a pole that is 60 feet high. Due to the slippery surface, the ape climbs 3 feet in a minute only to slip back 2 feet.

How much time do you think the monkey will take to reach the top of the pole?

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 ?

Replace the question mark with the correct number in below Picture: