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The average of the first four numbers is five times the fifth number. If the average of all five numbers is 84, then the fifth number is? |
22 25 20 28 |
20 |
Let fifth number = x Avg. of first 4 number = 5x Sum of first 4 number = 5x × 4 = 20 x Avg. = \(\frac{20x + x}{5}\) = 84 ⇒ 21 x = 84 × 5 x = 20 |
