You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

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?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

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

Explain?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

I know a nine-letter word having only one vowel.
Do you ?

In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'