81 x 9 = 801. What must you do to make the this equation true?

Find the missing number in the sequence below:

Replace the question mark with the correct number in the below-given picture?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

What is the last thing you take off before bed?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What can go up a chimney down, but can’t go down a chimney up?