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 :
Answer & explanation
Correct answer: option 1
Last number = (Sum of 25 numbers) - (Sum of first 10 + Sum of next 14 )
= ( 250 ) - [( 10 × 8 ) + ( 14× 11 ) ]
= (250) - ( 80 + 154) = 16