Asked by Tran

the bridge was built, the wood
contained 15 grams of carbon-14. How much carbon-
14 would it have contained when it was found by the
archaeologists? Round to the nearest hundredth
Answered by drwls
When was the bridge built? You have omitted important information. In fact, it looks like you have omitted at least one sentence and part of another.

Carbon-14 has a half-life of about 5,600 years.