There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Using Only Five 5's and any mathematical operator make sum as 37

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?