# SOLUTION: The average of 5 numbers is 48.The average of the first 3 numbers is 30. The forth number is 20 more then the fifth number. What is the fourth number.

Algebra ->  Algebra  -> Proofs -> SOLUTION: The average of 5 numbers is 48.The average of the first 3 numbers is 30. The forth number is 20 more then the fifth number. What is the fourth number.      Log On

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 Click here to see ALL problems on Proofs Question 460393: The average of 5 numbers is 48.The average of the first 3 numbers is 30. The forth number is 20 more then the fifth number. What is the fourth number.Answer by ankor@dixie-net.com(15746)   (Show Source): You can put this solution on YOUR website!The average of 5 numbers is 48.The average of the first 3 numbers is 30. The fourth number is 20 more then the fifth number. What is the fourth number. : "The average of 5 numbers is 48" = 48 a + b + c + d + e = 5(48) a + b + c + d + e = 240 : "The average of the first 3 numbers is 30." = 30 a + b + c = 90 : "The fourth number is 20 more then the fifth number." d = (e+20) e = (d-20) : In the 1st equation replace a+b+c with 90, replace e with (d-20) 90 + d + (d-20) = 240 2d = 240 - 70 2d = 170 d = d = 85 is the 4th number