Can you replace the question mark with the correct number?

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

Which tank will fill first?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

When it's bad luck to meet a black cat?

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?

Which flower has two lips?

what does this below rebus represent identXQQQQQME

Two men are in a desert. They both have packs on. One of the guys is dead. The guy alive has his pack open, and the guy who is dead has his pack closed. What is in the pack?

How do you go from 98 to 720 using just one letter?