Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

How many sides does a circle have?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

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

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

If a wheel has 54 spokes, how many spaces are there between the spokes?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?