Aptitude | Arithmetic Aptitude 6 | Question 6

The average of 21 results is 20. Average of 1^st 10 of them is 24 that of last 10 is 14. the result of 11’th is :
(A) 42
(B) 44
(C) 46
(D) 40

Answer: (D)
Explanation:

 11'th result = sum of 21 results – sum of 20 results
             = 21 x 20 – (24 x 10 + 14 x 10)
             = 420 – (240 + 140)
             = 420- 380 = 40

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