Average of 13 numbers is 63, the average of 1st 7 number is 63 and the average of last 7 numbers is 70. find the 7th number.
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average of first 7 numbers=(7*63)=441
average of last 7 numbers=(7*70)=490
average of 13 numbers =(13*63)=819
7th number =441+490-819
=931-819
=112/7=16
average of last 7 numbers=(7*70)=490
average of 13 numbers =(13*63)=819
7th number =441+490-819
=931-819
=112/7=16
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