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Quantitative Aptitude

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Percentage & Averages

Question
16 out of 20
 

The average of 8 numbers is 20. The average of first three numbers is 21. The average of last two is 15 . If the 6th number be less than fourth and fifth number by 4 and 7 respectively then the fifth number be



A 18
B 11
C 22
D 25
E None of these

Ans. D Sum of first three be 21x 3 = 64

Sum of last two number =

Sum of fourth, fifth and sixth number be 160 – (31 + 64) = 65

Let sixth number be X

Then fourth no. be x + 4

Fifth = x + 7

So x + x + 4 + x + 7 = 65

X = 18

So fifth number will be 18 + 7 = 25

Percentage & Averages Flashcard List

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