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The average of 25 numbers is 10 . The average of the first 10 numbers is 8 and that of the next 14 numbers is 11 . The last number is : |
16 18 20 22 |
16 |
Last number = (Sum of 25 numbers) - (Sum of first 10 + Sum of next 14 ) = ( 250 ) - [( 10 × 8 ) + ( 14× 11 ) ] = (250) - ( 80 + 154) = 16 |
