What does this rebus riddle means ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

You need to arrange three 7 and mathematical symbols to form number 1?

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?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

A pregnant woman is preparing to name her seventh child. Her children's names so far are Dominique, Regis, Michelle, Fawn, Sophie, and Lara. What will she name her next child -- Jessica, Katie, Abby or Tilly?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?