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Director
Joined: 06 Feb 2006
Posts: 912
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0% (00:00) correct
 0% (00:00) wrong based on 0 sessions
I often fail on these simple type of questions... simply adding values does not work for me... Can anybody show a clear principle, how to efficiently solve these type of questions:
Is the integer n a multiple of 140
1) n is a multiple of 10
2) n is a multiple of 14
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SVP
Joined: 05 Jul 2006
Posts: 1564
Followers: 4
Kudos [?]:
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Is the integer n a multiple of 140
1) n is a multiple of 10
2) n is a multiple of 14
rephrase
is n = 140k
from one
n= 10z.....insuff
from two
n = 14 r....insuff
both together
n has 2,7,5 ( eg n = 2*7 r and r is a multiple of 5 and or n = 2*5 z and z is a multiple of 7 )
so all we know that 2,5,7 are among the prime factors of n ie = 70L......INSUFF
MY ANSWER IS E
Last edited by yezz on 16 Oct 2006, 12:50, edited 1 time in total.
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Senior Manager
Joined: 30 Aug 2006
Posts: 375
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LCM of 10 & 14
10 - 2,5
14 - 2,7
2*5*7 = 70
so no INSUFF
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Director
Joined: 06 Feb 2006
Posts: 912
Followers: 1
Kudos [?]:
16
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Ok clearer now...
so if the question would ask is n a multiple of 12
1)n is a multiple of 4
2)n is a multiple of 3
this would be C, right?
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SVP
Joined: 05 Jul 2006
Posts: 1564
Followers: 4
Kudos [?]:
65
[0], given: 37
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100% right 
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close
