Question
The average age of a group of
five friends is 78 years. If a friend, aged 48 years, is replaced by another friend, then the average age of each friend in the group will increase by 4 years. Find the age of the friend who was replaced.Solution
ATQ,
Sum of the ages of 5 friends, initially = 5 X 78 = 390 years Let the age of the new friend who joined the group = 'y' years Therefore, 390 - 48 + y = 5 X (78 + 4) Or, 'y' = 410 - 342 = 68 Therefore, age of the new friend = 68 years Alternate Solution Age of the new friend = age of the friend replaced + increase in average age X number of friends So, age of the new friend = 48 + 5 X 4 = 48 + 20 = 68 years
Read the given statements and conclusions carefully. Decide which of the given conclusions is true based the given statements.
Statement: Dhoni i...
Statements: P = T > U ≤ E = W < X , R < O < E ≥ Y > Q = F
Conclusions: I. X > Q II. P < R
The Sahariyas are members of an indigenous tribe which has for centuries occupied an area now located partly within the state of Rajasthan and partly wi...
Statements: N < W; W ≤ A; G > A; Y ≥ A
Conclusions:      I. Y ≥ W                II. G > W            ...
Statements: A < B < C < P > Q
Conclusions: I. Q < BÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â II. P > A
...Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at varianc...
Statement:
Only few Lion are tiger
No tiger are dog.
Only cat are dog.
Conclusion:
I. Some lion are tiger.
A statement is given followed by two conclusions I and II. Consider the given statement as true and decide which of the given conclusions logically fol...
Statements:
All books are erasers.
No sharpener is pencil.
All pencils are books.
Only a few pencils are bright.
Conc...
Statements: V > U = T ≤ S; T > Z > L; L = N ≥ O
Conclusions:
I. V > L
II. O < S
III. T > V
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