I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

At a bar, three friends, Mr Green, Mr Red and Mr Blue, were having a drink. One man was wearing a red suit; one a green suit; and the other a blue suit. 'Have you noticed,' said the man in the blue suit, 'that although our suits have colours corresponding to our names, not one of us is wearing a suit that matches our own names?' Mr Red looked at the other two and said, 'You're absolutely correct. What colour suit is each man wearing?

What is full of holes but still holds water?

I am an odd number. Take away a letter and I become even. What number am I?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Can you solve the below tricky visual equation?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?