Question

Average of 11 numbers is 53 the average of first six numbers is 50 and that of the last six number is 55. The sixth number is?

Answer 1

Step-by-step explanation:

Average of 11 numbers=53 so the sum of 11 numbers= 53×11=583. Average of first six numbers =50 so the sum of first six numbers is 50(6)=>300. The sum of last six numbers is 55(6)=>330 as average of last six numbers is 55. Hence add sum of first six numbers and sum of last six numbers we get 300+330=>630. Subtract sum of 11 numbers from 630 =>630-583 =>47 is the sixth number. Hope it helps you.