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This thread is dedicated to preparation for Numerical Ability section of AFCAT. You may share questions related to topics like Arithmetic, Algebra, Geometry & Measurement, Statistics, Modern Mathematics etc.
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of an hour. B worked for the next 
of an hour and C worked for the remaining 
, the new mean of the set of observations will be _____.
How did 2x 3 get changed to 2x 13?