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The average of five positive numbers is 308. The average of first two numbers is 482.5 and the average of last two numbers is 258.5. What is the third number.

  • a)
    224                          

  • b)
    121

  • c)
    58                            

  • d)
    Cannot be determined

  • e)
    None of these

Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The average of five positive numbers is 308. The average of first two ...
Let the numbers be A1, A2 , A3 , A4 , A5


► Average of 5 numbers = (A1 + A2 + A3 + A4 + A5) / 5 = 308


► Now A1 + A2 + A3 + A4 + A5 = 308 x 5 = 1540


► Also,A1 + A2 = 482.5 x 2 = 965


and A4 + A5 = 258.5 x 2 = 517 


► A3 = 1540 − 965 − 517 = 58


 


So, the correct option is 'C'
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Most Upvoted Answer
The average of five positive numbers is 308. The average of first two ...
Average of 5 no. = 308 Sum of 5 no. Will be 308 ×5 = 1540 Average of first 2 no. = 482.5 Sum of first 2 no. will be 482.5 × 2= 965 Average of last 2 no= 258.5 Sum of last 2 no. will be 258.5 × 2 = 517 Third no. = Sum of 5 no. - Sum of 4 no. i.e. 1540 - 1482=58
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The average of five positive numbers is 308. The average of first two ...
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