Assuming this is one of those "offbeat" interview questions. My answer is what I honestly would say vocally without research or paper to write formulas.
If the approximate diameter of the plane is 20 feet, then I have a 10 foot radius, I can't remember the exact formula for area of a circle but if I made four squares of 10 feet and dived by 3 that would be a close guess. So 10 feet = 120 inches x 120 inches = 14,400 square inches x 3 = 43,000 square inches. So for every inch of volume I can fit 43,000 bearings. My best guess on the length of the plane is 200 feet, so 43,000/inch = ~500,000/foot. Therefore I would estimate that 100 million bearings could fit inside the skin of a completely empty 747.
607
The room is 6480 cubic feet. If 192 tennis balls fit in (3 feet) cubed, that's 27 cubic feet and 46,080 tennis balls fit in 6480 cubic feet.
it depends on the car
312 tennisballs.
Since a tennis ball has a diameter that is greater than 2 inches, the answer is 0.
5 if i balance one on top!
15000
Approximately 19 million.
It would depend on the size of the tennis balls, but assuming a standard 2.63 cubic inches per ball, you would need approximately 122,321 tennis balls to fill 106.6 cubic feet.
1
241920 in^3 == typical minivan cargo volume (V) 17.576 in^3 == volume of a cube surrounding a tennis ball (v) 13764 == V/v = number of tennis ball sized cubes to fit into the cargo space of a minivan
747-400 can hold up to 524 with a business/economy configuration.