How many triangles can you find in this given picture?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

What has no start, end, or centre?

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

Replace the question mark with the correct number below.

Can you spot the hidden girl in the picture below?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?

A father's child, a mother's child, yet no one's son.

Who am I?

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