Quantitative Aptitude Ques 1111
Question: Four quantities are such that their average is same as the average of first three quantities. The fourth quantity is
Options:
A) sum of first three quantities
B) (sum of all four quantities)/4
C) (sum of first three quantities)/3
D) (sum of first three quantities)/2
Show Answer
Answer:
Correct Answer: C
Solution:
- Let the four quantities be a, b, c and d. According to the question, $ \frac{a+b+c+d}{4}=\frac{a+b+c}{3} $
$ \Rightarrow $ $ 3a+3b+3c+3d=4a+4b+4c $
$ \Rightarrow $ $ 3d=a+b+c $
$ \Rightarrow $ $ d=\frac{a+b+c}{3} $ = Sum of first three quantities/3
BETA
