In 2024, Jeff Bezos was again named the world's richest person, with a net worth of two hundred billion dollars.
In the Great Depression, lots of people took all their cash and hid it under a mattress in their
home because they feared that banks were not safe.
If Jeff Bezos took his entire fortune in one dollar bills and put them in a single vertical pile under his mattress,
how tall would the pile be?
Give your answer to the nearest ten miles.
Scroll down for a hint...
The thickness of a dollar bill is 0.004375 inches.
Solution:
Two hundred billion dollar bills would be 13,810 miles high.
This is a dimensional analysis problem.
Take 200,000,000,000 and multiple by 0.004375 to get 875,000,000 inches.
Divide by 12 to get 72,916,666.6667 feet.
Divide by 5,280 to get 13,809.974 miles.
Correctly solved by:
| 1. Kamal Lohia |
Holy Angel School, Hisar, Haryana, India |
| 2. Davit Banana | Istanbul, Turkey |
| 3. Dr. Hari Kishan |
D.N. College, Meerut, Uttar Pradesh, India |
| 4. Ryan Hall |
Parkview Elementary, Chico, California, USA |
| 5. K. Sengupta | Calcutta, India |
| 6. Colin (Yowie) Bowey | Beechworth, Victoria, Australia |
| 7. Mrs. Painter's 2nd block Honors Precalculus Class |
Broome High School, Spartanburg, South Carolina, USA |
| 8. Mrs. Painter's 4th block Honors Precalculus Class |
Broome High School, Spartanburg, South Carolina, USA |
| 9. Ivy Joseph | Pune, Maharashtra, India |