Question

average of six number is 66.if the five numbers be54,65,75,67 and 45.Find the six number?
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Answer 1

Answer:

The average of a set of numbers is (sum if terms )/ (number of terms ) .Let the sixth number be x . 66 = (54+64+75+67+ 45 + x)/6 ; 396 = 54 +64+75+67+x ; 396 = 305 + x ; x=91.

Answer 2

Answer:

average of six numbers- 66

So total- 66*6= 396

the five numbers are 54, 65 ,75 ,67 and 45

So sum of five numbers are = 54+65+75+67+45=306

So,the sixth number is 396-306=90