Question

The average of 5 numbers is 7. When 3 new numbers are added, the average of the eight
numbers is 8.5. The average of three new numbers is:



Anwer

average aur 5 number = 7
= 5*7 = 35
3 number added
So the average of 8 number = 8.5
= 8*8.5 = 68
Average of 3 number = 68-35= 33/3
= 11 answer

Answer 1

average aur 5 number = 7

= 5×7 = 35

3 number added

So the average of 8 number = 8.5

= 8×8.5 = 68

Average of 3 number = 68-35= 33/3

= 11

Answer 2

The average of the 3 new numbers is 11.

Given:

The average of 5 numbers = 7

New average after adding 3 numbers = 8.5

To Find:

We need to find the average of the three new numbers

Solution:

Average = sum/number of terms

⇒ 7 = sum/5

⇒ Sum of the 5 original numbers = 35

Now, new average = sum of the 8 numbers/8

⇒ 8.5 = sum/8

sum of the 8 numbers = 68

⇒ 68 = sum of the initial 5 numbers + sum of the 3 new numbers

sum of the 3 new numbers = 68 - 35

= 33

Thus, the average of the 3 new numbers = 33/3

= 11

Hence, the average of the 3 new numbers is 11.

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