What will be the Fourth Number? If

The average of 6 numbers is 30. If the average of first four is 25 and that of last three is 35, the fourth number is

  1. 25
  2. 30
  3. 35
  4. 40
Desire Adnan Default Asked on 2nd August 2015 in Maths.
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1 Answer(s)

Answer: (1) 25
Explanation:-
The average  of   6 numbers = 30
The sum of 6 numbers = 30 x 6
= 180

The average of first four numbers = 25
Then, the sum of first four numbers = 25 x 4  = 100

The average of last three numbers = 35
Then, the sum of last three numbers = 35 x 3  = 105

Fourth number is = (100 + 105) – 180
= 205 – 180
= 25
Hence, the fourth number is 25.

Anurag Mishra Professor Answered on 3rd August 2015.
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