What does this below rebus puzzle mean?

Find the value of "?" in the ball picture Riddle below:

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?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Solve below rebus puzzle?

What is the Surname of Barbie Doll?

What kind of band never plays music?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

John is the son of Jacob.
So,
Jacob is the_____of John's father?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?