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Source: — Data Sufficiency |
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by mental » Wed Jan 07, 2009 10:08 am
given both m and n >0

we cross-multipy

the question becomes, is mn+nx > mn + mx
mn + nx -mn - mx >0
x(n-m)>0
for this to be true
either x>0 and n>m
or x<0 and n<m

St1: gives only one info: INSUFFICIENT
st2: gives only one info: INSUFFICIENT

Together we know both x>0 and m<n: Sufficient
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by vivek.kapoor83 » Wed Jan 07, 2009 11:27 am
hv query here,
for eq to be true both condition in each eq should be true.How can u choose 1 from stm1 & stm2 ..is this possible.?
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by cramya » Wed Jan 07, 2009 6:26 pm
To find m+x/n+x > m/n

(or) m+x/n+x - m/n>0

x(n-m)/n(n+x) >0


Stmt I

m<n

No idea what x could be or how n+x turns out

INSUFF

Stmt II

x>0

No info on m,n other than both are greater than 0

INSUFF

Together

x>0 m>0 n>0 n>m

x(n-m)/n(n+x) >0

SUFF

Choose C)
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