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A total of \(20\) amounts are entered on a spreadsheet that has \(5\) rows and \(4\) columns; each of the \(20\) positions in the spreadsheet contains one amount. The average (arithmetic mean) of the amounts in row \(i\) is \(R(i), (1\le i \le 5).\) The average of the amounts in column \(j\) is \(C(j), (1\le j \le 4).\) What is the average of all \(20\) amounts on the spreadsheet?
(1) \(R(1) + R(2) + R(3) + R(4) + R(5) = 550\)
(2) \(C(1) + C(2) + C(3) + C(4) = 440\)
Answer: D
Source: GMAT Prep
(1) \(R(1) + R(2) + R(3) + R(4) + R(5) = 550\)
(2) \(C(1) + C(2) + C(3) + C(4) = 440\)
Answer: D
Source: GMAT Prep
