Decode below three cipher riddles:

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

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

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.)

Which English verb becomes past tense just by rearranging the letters?

Two friends Smith and Andrew were talking about the bravery of their families. Smith told great stories about his courageous grandfather who fought for Britain in "World War I". Andrew told that his grandfather was so brave that in 1919 just after the war he was honoured with a bravery medal with the words "For our Courageous Soldiers In World War I" embedded into it. Smith knows that his friend is lying. How?

Can you find out the missing number in the grid?

What is the next number in this matchsticks series riddle?

John bought 150 chocolates but he misplaced some of them. His Father asked him how many chocolates were misplaced.
He gave the following answer to him:
If you count in pairs, one remains
If you count in threes, two remain
If you count in fours, three remain
If you count in fives, four remain
If you count in sixes, five remain
If you count in sevens, no chocolate remains.

Can you analyze the statements and tell us how many chocolates were lost?

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

Explain?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?