Question

the average of six numbers is 65. the average of five of them is 72. find the sixth number
​

Answer 1

Answer:

The average of five numbers is 72, so the total is 5*72 = 360

Call the sixth number x

(360 + x)/6 = 65

360 + x = 390

x = 30

Step-by-step explanation:

Answer 2

Step-by-step explanation:

let the sum of six number is (x1+x2+x3+x4+x5+x6)

it's average is ( x1+x2+x3+x4+x5+x6 )/6

and the average of 5 numbers is

( x1+x2+x3+x4+x5 )/5 = 72

x1+x2+x3+x4+x5 = 72 ×5 = 360

the average of six numbers is ( x1+x2+x3+x4+x5+x6 )/6 = 65

so, (360+ x6)/6 = 65

360+x6 = 390

this implies x6 = 30

so the sixth number is 30..

hope this will help you ☺️ please follow me as I am new here..

follow me