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

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

Can you find the 09 errors in the picture below?

John leaves home and then he takes three right turns. John wants to return to home but he was scared of Jacob, who is wearing a mask.

What is John Situation ?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What is black when you buy it, red when you use it, and gray when you throw it away?

What is the last thing you take off before bed?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?