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

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

  • Option 1)

    25

  • Option 2)

    50

  • Option 3)

    35

  • Option 4)

    40

  • Option 5)

    30

Answers (1)

best_answer

Sum \: of\: 6\: numbers = 6*30 = 180
A_{1}+ A_{2}+ A_{3}+ A_{4} = 4*25=100 ------(i)
A_{4}+ A_{5}+ A_{6} = 3*35=105 ------(ii)
Adding (i) \: \: and\: \: (ii)
A_{1}+ A_{2}+ A_{3}+ 2A_{4}+ A_{5}+ A_{6}=205
A_{4} = 205-180=25

Posted by

rishi.raj

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