Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

Why do people go to bed?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Whats the next number in the below number sequence pattern.