Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

How many times in a given day, minutes and hour clock comes in a straight line ?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

You need to arrange three 7 and mathematical symbols to form number 1?