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The average of 20 numbers is 22. If one number is excluded, the average becomes 20. Find the excluded number?

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122

answer is A.

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Detailed Solution

Let the excluded number be the ‘X’

Sum of 20 numbers $= 22 \times 20 = 440$

After excluding ‘x’,

Sum of 19 numbers $= 20 \times 19 = 380$

$∴ x = 440 - 380 = 60$

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