Competitive Exam Trainer Practice or CET Practice aspires to be a personal subject, preparation and answering technique trainer for students appearing for competitive examinations.

Thursday, March 12, 2015

If 10% of a radioactive material decays in 5 days, then the amount of original material left after 20 days is approximately:
A) 70%
B)75%
C)65%
D)60%

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