Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

What happened when the wheel was invented?

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

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Can you spot the man between the coffee bean in the picture below ?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

What is the largest number you can write with just 3 digits?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H