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21 May 2016, 03:49
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A
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Difficulty:
75%
(hard)
Question Stats:
33% (01:31) correct
67%
(01:32)
wrong
based on 46
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If the average age of three people is 21 years, is the youngest older than 13?
(1) The oldest is 25.
(2) One person is 24.
(1) The oldest is 25.
(2) One person is 24.
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21 May 2016, 05:50
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Bunuel
Hi
average of 21 means sum of age is 21*3 = 63...
(1) The oldest is 25.
To make the youngest the least, make the other two the oldest...
so the two eldest = 25+25 = 50..
age of youngest = 63-50 =13..
so youngest will be at the least 13, so he can be 13 or >13.....
so our answer for " is the youngest older than 13" will be NO, if he is 13..
and YES, if he is >13
Insuff
(2) One person is 24.
Nothing can be said about the other two
example -
1, 24, 38----- YES
18,21,24------ NO
Insuff
Combined-
one is 25 and other is 24.. third will be 63-25-24 = 14..
ans is YES
Suff
C
21 May 2016, 07:20
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chetan2u
HI chetan , for statement 1 .. youngest is at least 13 means he can 13 or > 13 rt ?
how can we say youngest 13 here ? other two both eldest is our assumption so we are not sure whether he >13 or =13.
If we combine it's very clear .
