Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

James Bond is caught up in a mysterious scenario where the evil villain has him blindfolded. He somehow breaks through the handcuffs but is unable to get the blindfold off. Upon searching, he comes across a bow and 3 arrows. He can hear the villain speak, and thus tries to take a shot at him. He launches the first arrow, it misses the villain. He then launches the second arrow and it misses by a greater margin.

What is the probability that this third shot our James bond takes will be worse than the second shot?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Which is Odd One Out and why?

4377

3954

9862

8454

9831

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.

What is the centre of gravity?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

Why do people go to bed?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?