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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 a 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
