Can you fill the blank with the correct number?

6 30 870 756030 _____

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

Can you replace the question mark with the correct number?

Find the next number in the series.
1 10 24 43 67 ?

Can you place six X (crosses) in below board without making three in a row in any way ?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

When can we add 2 to 11 and get 1 as the correct answer?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

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