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Quantitative Aptitude

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Percentage & Averages

Question
13 out of 30
 

The average of 9 numbers is 30. The average of first 5 numbers is 24 and the last 3 number is 36. Then what is 6th number.



A 20
B 30
C 42
D 50
E None of these

Ans. C Total sum = 30 × 9 =270

6th number = 270 – [(5 ×24) +(3 ×36)]

270 – [120+108]

270-228 = 42

Percentage & Averages Flashcard List

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