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What was the average (arithmetic mean) monthly rainfall

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What was the average (arithmetic mean) monthly rainfall [#permalink] New post 22 Jul 2003, 19:57
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What was the average (arithmetic mean) monthly rainfall during 1984 in region Y?

(1) In region Y the total rainfall for the first 6 months of 1984 was twice the total rainfall for the last 6 months of 1984.
(2) In region Y the average monthly rainfall for the first 6 months of 1984 was 2.31 inches more than the average monthly rainfall for the last 6 months of 1984.

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Answer [#permalink] New post 22 Jul 2003, 22:13
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(1) Could be any two numbers X and 2X
(2) Could be any two X and X + 2.31

Need to combine the two to get the first 6 months is 4.62 EACH and the second 6 months is 2.31 EACH. This is suff.
Answer   [#permalink] 22 Jul 2003, 22:13
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What was the average (arithmetic mean) monthly rainfall

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