Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

Can you solve the rebus below?

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.

Complete the table series riddle by finding the number that can replace "??".

What part of the chicken has the most feathers?

Can you count the number of matches in the picture below ?

What seven-letter word has hundreds of letters in it?

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

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?