R

Ruchi Sharma • 9.84K Points
Tutor III Math 

Q. Out of four number, the average of first three is 15 and that of the last three is 16, if the last number is 19, the first is ?

  • (A) 15
  • (B) 16
  • (C) 18
  • (D) 19
Correct Answer - Option(B)
Explanation by: Ruchi Sharma 
Sum of four number = ( 15 x 3 + 19 ) = 64
Sum of last three number = ( 16 x 3 ) = 48
∴ first number = ( 64 – 48 ) = 16

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