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The average of numbers is . The average of the first numbers is and that of the last numbers is . What is the number?

  1. A
    20
  2. B
    30
  3. C
    40
  4. D
    50

Solution & Step-by-step Explanation

Step 1: Find the total sum of all 9 numbers.


Step 2: Find the sum of the first 5 numbers.



Step 3: Find the sum of the last 3 numbers.



**Step 4: Find the number.**
The total sum consists of the sum of the first 5 numbers, the number, and the sum of the last 3 numbers.





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Try it yourself before checking the explanation above.

The average of numbers is . The average of the first numbers is and that of the last numbers is . What is the number?
A
20
B
30
C
40
D
50

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