Question

the average of six numbers is 9. if the average of first five of these numbers is 8, what is the sixth number?​

Answer 1

Answer:

Average of 6 is 9

then total is 6×9 = 54

Average of 5 is 8

then total is 5×8 = 40

than sixth number is 54 - 40 = 14

Answer 2

SOLUTION

GIVEN

• The average of six numbers is 9

• The average of first five of these numbers is 8

TO DETERMINE

The sixth number

EVALUATION

Here it is given that the average of six numbers is 9

∴ Sum of six numbers

= 6 × 9

= 54

Now the average of first five of these numbers is 8

∴ Sum of first five of these numbers

= 5 × 8

= 40

Hence the required sixth number

= Sum of six numbers - Sum of first five of these numbers

= 54 - 40

= 14

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