How can you write nineteen in a manner that if we take out one, it becomes twenty?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

Count the Triangle in the figure given below:

What is the word or phrase?

There is an exact a week gap between Christmas and New Year. Hence, It is obvious that the new year that comes right after Christmas comes on the same day of the week.

A Strange thing happened in the Year 1777. Christmas occurs on Wednesday and New Year on Monday. How is that possible?

I’m tall when I’m young, and I’m short when I’m old. What am I?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

Can you identify the hidden rebus in the image below?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?