How many approx. mg are in 1 grain?

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The North American Pharmacist Licensure Examination (NAPLEX) is designed to evaluate general practice knowledge and is taken by recent college of pharmacy graduates shortly after they receive their degree. The exam is also taken by foreign-educated pharmacists who have earned FPGEC Certification.
The NAPLEX is a 250-question, multiple choice, computerized examination.
 


1. How many approx. mg are in 1 grain?