If 21x = 79x, what is the value of x?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

Which Travels Faster? Solve below famous picture riddle:

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

If eleven plus two equals one, what does nine plus five equal?

Can you decipher the two rows to find the hidden word?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?