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39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?
Complete the table for the radioactive isotope.
The isotope is 14C.
The half life(years) is 5715.
The Inital quantity is 39.5 g.
What is the amount after 1,000 years?