Is positive integer x divisible by 48?

Question

(1) x is divisible by 8.

(2) x is divisible by 6.

EgmatQuantExpert · Answer

Solution

Given:  
• x is a positive integer

To find:  
• Whether x is divisible by 48 or not

Analysing Statement 1  
• As per the information given in Statement 1, x is divisible by 8
 o From this, we cannot say x is divisible by 48 – it may divisible by 48 (like if x = 96) or it may not be (like x = 88) 
Hence, Statement 1 is not sufficient to answer

Analysing Statement 2  
• As per the information given in Statement 1, x is divisible by 6
 o From this, we cannot say x is divisible by 48 – it may divisible by 48 (like if x = 96) or it may not be (like x = 90) 
• Hence, Statement 2 is not sufficient to answer

Combining Both Statements  
• Combining both the statements, we can say x is divisible by both 6 and 8
 o From this we can say, x is divisible by LCM(6, 8) = 24 
• But it does not guarantee that x is divisible by 48 even if it is divisible by 24 (like if x = 72)
Hence, we cannot answer after combining the statements

Hence, the correct answer is option E.

Answer: E

akadiyan · Answer

Is positive integer x divisible by 48?

(1) x is divisible by 8 - x can have more than 1 value. For eg , x can be 8,16,24 and also 48 - Not sufficient.

(2) x is divisible by 6 - x can have more than 1 value , for eg , x can be 6,12,18,24 and also 49 - Not sufficient.

Both 1 & 2 - X can be 24 , 48 or any other. Insufficient.

Ans:   E

Doer01 · Answer

Hi,

Let the prime factors of x be  P^a * Q^b * ....so on 
To check if it is divisible by 48, it must have atleast the prime factors of 48 in same or more number. i.e. x must have at least 4 2s and one 3.

1) if x is divisible by 8, it will have at least 3 2s as its prime number but this condition does not give us any information about one more 2 and a 3. Hence, not sufficient.

2) if x is divisible by 6, it will have atleast one 2 and one 3 as its prime factor. We are still short of 3 2s to prove its divisibility by 48. Hence not sufficient.

Combining 1 & 2 we get that it will have at least 3 2s and one 3. still not enough information to prove.

Hence, E is the correct choice.

KSBGC · Answer

we are asked to find out whether x is divisible or not. To be divisible by 48 x has to be the multiple of 48.

statement 1: x is divisible by 8. So, x could be 8, 16, 24 etc. if x is divisible by 8 it doesn't necessarily mean that x will be divisible by 48. Consider x=8, 16. Thus statement 1 is not sufficient.

statement 2: x is divisible by 6. This one is the same as statement 1. x is divisible by 6 doesn't mean that x will be divisible by 48. Insufficient.

combining both statement : we all know is that x is LCM of both 6 and 8 which is 24. x is multiple of 24. So x could be 24, 48 etc. Still we don't have sufficient data to answer this question. If we take 24 as a value of x it is not divisible by 48 but if x is 48 , x is divisible by 48.

Thus the best answer is E.

ramlala · Answer

Is positive integer x divisible by 48?

(1) x is divisible by 8.
Ans: 8, 16, 24, 32, 40, 48, 56,....
 Not sufficient

(2) x is divisible by 6.
Ans: 6, 12, 18, 24, 30, 36, 42, 48, 54,....
 Not sufficient

Both....
A: 8, 16,  24 , 32, 40,  48 , 56,....
B: 6, 12, 18,  24 , 30, 36, 42,  48 , 54,....

24 is not divisable by 48
 Not sufficient

Ans: E

BrentGMATPrepNow · Answer

Target question :    Is positive integer x divisible by 48?

When I scan the two statements, they both feel insufficient, AND I’m pretty sure I can identify some cases with conflicting answers to the  target question . So, I’m going to head straight to……

Statements 1 and 2 combined    
Statement 1 tells us that x is divisible by 8.
Statement 2 tells us that x is divisible by 6
There are many values of x that satisfy BOTH statements. Here are two: 
 Case a : x = 48. In this case, the answer to the target question is  YES, x is divisible by 48 
 Case b : x = 24. In this case, the answer to the target question is  NO, x is not divisible by 48

Answer: E

Cheers,
Brent

AnirudhaS · Answer

Stem says is x divisible by  2^4.3

Combining (1)+(2) 
LCM of 8 and 6 =  2^3.3 
If the LCM had one more 2, then the answer would have been YES.
Right now we do not know, it may or may not be.

Answer:  E

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Is positive integer x divisible by 48?

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