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Source: — Data Sufficiency |
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by frank1 » Thu May 20, 2010 9:22 pm
colakumarfanta wrote:Is p-q is divisible by 5
(1) p is divisible by 5
(2) pq is divisible by 5
1 nothing about q so A and D out

2)5x3=15 but 5-3=2 not divided by 5
5x10=50 divided by 5 and 10-5=5/5 is divisibe
so B out

C .....i think explanation for 2 rules out c as well as thought 5 is divisible by 5 ...there is dual case

so E for me
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by liferocks » Thu May 20, 2010 9:22 pm
From 1
p is divisible by 5...no information on whether q is divisible by 5....not sufficient

From 2
pq is divisible by 5...this can happen if either of p and q is divisible and the other is not divisible by 5...not sufficient

Combining
p is divisible by 5...so pq will be divisible by 5...can not conclude anything for q...not sufficient
IMO ans option E
"If you don't know where you are going, any road will get you there."
Lewis Carroll
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