A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Why do you find that most of the buildings are deprived of the 13th floor?

What Deficiency does the below rebus represent?

VIT_MIN

Can you count the number of triangles in the picture below?

No matter how little or how much you use me, you change me every month. What am I?