SOLUTION: The average (arithmetic mean) of 80, 83, 89, and x is the same as the average of 80, 83, and 86. What is the average of 82 and x?
(A)80 (B) 81 (C) 82 (D) 83 (E) 84
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Question 311486: The average (arithmetic mean) of 80, 83, 89, and x is the same as the average of 80, 83, and 86. What is the average of 82 and x?
(A)80 (B) 81 (C) 82 (D) 83 (E) 84
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
The average (arithmetic mean) of 80, 83, 89, and x is the same as the average of 80, 83, and 86.
:
=
:
=
Cross multiply
3(252+x) = 4(249)
:
756 + 3x = 996
:
3x = 996 - 756
:
3x = 240
x =
x = 80
:
What is the average of 82 and x?
= 81
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