Logical Reasoning - Logical Problems - Discussion

Each problem consists of three statements. Based on the first two statements, the third statement may be true, false, or uncertain.

3. 

Joe is younger than Kathy.
Mark was born after Joe.
Kathy is older than Mark.
If the first two statements are true, the third statement is

[A]. true
[B]. false
[C]. uncertain

Answer: Option A

Explanation:

Joe is younger than Kathy and older than Mark, so Mark must be younger than Kathy.

Ajit Singh said: (Apr 23, 2011)  
I can't get it. Please explain in detail.

Sundar said: (Apr 23, 2011)  
@Ajit Singh

The given answer is correct. Let me explain in detail.

1. Joe(J) is younger than Kathy(K) = J < K

2. Mark(M) was born after Joe(J) = M < J

Combine 1 and 2, Result = M < J < K

Now,

3. Kathy(K) is older than Mark(M) = M < K


From this: M < J < K We can understand that K is older than M.

Hope this explanation may help you. Have a nice day!

Yozaam said: (Sep 14, 2020)  
@All.

Those who are confused about why it is not uncertain, please understand that;

"born after" ~ is same as ~ "younger".

Sanar said: (Jan 5, 2021)  
Here answer be C because Kathy can be older or younger than Mark which is not exactly explained here.

Ayush Singh said: (Feb 9, 2021)  
The answer should be C (uncertain).

Since it's given that 1st and 2nd statement are true that means J<K and M>J. Now the possible solutions are J<M<K or J<K<M.

Prithvi Raj said: (Mar 20, 2021)  
The answer should be C because no one's age is given plus if there was a statement "Kathy is older and Joe and Mark" then the answer would have been A. Here Mark can be older to Kathy.

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