What does this Rebus Picture means ?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Which number should replace the question mark?

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?