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20 Mar 2024, 03:22
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Correct: Elle is older than Wahida.
Incorrect: Wahida is the oldest among the four.
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
67% (02:41) correct
33%
(02:57)
wrong
based on 1540
sessions
History
Date
Time
Result
Not Attempted Yet
Elle, Wahida, Yeli, and Zack stay in the same house. Elle is three times older than Yeli. Zack is half the age of Wahida. Yeli is older than Zack.
Select Correct and Incorrect, for what can be definitely concluded to be correct and incorrect respectively, based on the information given above. Make only two selections, one in each column.
Select Correct and Incorrect, for what can be definitely concluded to be correct and incorrect respectively, based on the information given above. Make only two selections, one in each column.
| Correct | Incorrect | |
| Yelli is older than Wahida. | ||
| Wahida is older than Yeli. | ||
| Elle is older than Wahida. | ||
| Among the four, Yelli is older than only Zack. | ||
| Wahida is the oldest among the four. |
ShowHide Answer
Official Answer
Correct: Elle is older than Wahida.
Incorrect: Wahida is the oldest among the four.
04 Jul 2024, 05:39
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E=3Y..................(i)
Z=1/2 W..............(ii)
Y>Z.....................(iii)
E>Y>Z
therefore
Y=E/3...........from(i)
Because Y>Z
Therefore E>3Z
and from (ii)
W=2Z
Therefore
E>W
Z=1/2 W..............(ii)
Y>Z.....................(iii)
E>Y>Z
therefore
Y=E/3...........from(i)
Because Y>Z
Therefore E>3Z
and from (ii)
W=2Z
Therefore
E>W
General Discussion
26 May 2024, 00:11
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My approach was, considered 2 cases:
Case 1: z=10 and y=30 it makes, w=20 and e=90 , so E>Y>W>Z
Case 2: z=20 and y=30 it makes, w= 40 and e=90, so E>W>Y>Z
I dont think there can be any other valid scenarios as per the given condition (Elle is three times older than Yeli. Zack is half the age of Wahida. Yeli is older than Zack.)
In both the above cases, the INCORRECT one is Wahida is the oldest among the four, (Elle is the oldest) and the CORRECT is "Elle is older than Wahida."
Other options may or may not happen based on the considerations above.
Experts can correct/reply in case this needs correction. thanks!
Case 1: z=10 and y=30 it makes, w=20 and e=90 , so E>Y>W>Z
Case 2: z=20 and y=30 it makes, w= 40 and e=90, so E>W>Y>Z
I dont think there can be any other valid scenarios as per the given condition (Elle is three times older than Yeli. Zack is half the age of Wahida. Yeli is older than Zack.)
In both the above cases, the INCORRECT one is Wahida is the oldest among the four, (Elle is the oldest) and the CORRECT is "Elle is older than Wahida."
Other options may or may not happen based on the considerations above.
Experts can correct/reply in case this needs correction. thanks!
