The Gateway Arch in St. Louis, MO is approximately 630 ft tall. How many U. S. half dollars would be in a stack of the same height? Each half dollar is 2.15 mm thick.

To equal the height of the Gateway Arch in St. Louis, it would take 76810 half dollars.

Explanation:

If the Gateway Arch in St. Louis is 630 feet high, how many half dollars will it take to equal the height if each half dollar is 2.15mm thick?

First, we convert the ft to cm and the cm to mm.

- 1 ft = 30.48 cm

630 ft = 19202.4 cm

- 19202.4 cm = 192024 mm

Now, if a half dollar is 2.15 mm thick, how many half dollars would it take to equal the height of 192024 mm?

1 half dollar = 2.15 mm

X                 = 192024 mm

X = 192024 mm / 2.15 mm

X = 76810 half dollars.

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