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40,000 tonnes is about one-twentieth as heavy as The Golden Gate Bridge.
In other words, it's 0.0497 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 20.10 times that amount.
(San Francisco, California and Marin County, California) (Post 1986 weight reduction; total weight of bridge, anchorage, and approaches)
Following the completion of the 1986 project to eliminate excess material, the total weight of the Golden Gate Bridge — including its anchorages and approaches — is 805,000 tonnes. The two main cables in the spanning the bridge are spun out of a total of 129,000 km (80,200 mi) of wire.
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