Which part of London exists in France as well ?

What does this rebus mean?

O
N
C
E
TIME

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don't know which is which.
There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.
You can, however, ask one robot one question. The problem is one robot always tells the truth, the other always lies and you don't know which is which.
What is the question you ask?

Prove that the below maths equation is true.

8 + 8 = 91

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

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

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?