What number comes next in the series?

5 15 5 18 5 24 14 20 _

What four weights can be used to balance from 1 to 30 pounds?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

What is wrong in the below Picture?

Find the number of squares in the below-given picture.

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

French Police inspects a room where there are no windows, no doors, no tables and is almost empty expect there is just a puddle of water. They found a dead man who obviously hung herself from the ceiling, but they are not able to figure out how this had happened.

John and Jacob entered the crime scene and easily able to solve the case.

How did the man die?

In which direction should the missing arrow point?