time Exam Numerical Ability Number System

anita attempted to find the average of ten two digit numbers.one of the numbers a,was the reverse of one of the others.if these two numbers are replaced by the two digit numbers, c and the reverse of c, anita would find the average of these numbers to be 6.6 more than the average of teh original set of numbers.find the value of (sum of the digits of c) - (sum of the digits of a).
a.3 b.4 c.6 d.2

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