inequality-- data sufficiency

[adeel]

Q, Is X -ve number??

1, 9x > 10x

2, x+3 is +ve

the answer is A according to gmat off guide

my Q is its easy if we take into account only integers to arrive to the ans A.

but how do u decide not to check for fractions

i.e if x =1/90

then 1 becomes 1/9 > 1/10

which is true

does the word number in the question suggest to check only for intergers,

if we need to check for fractions will the Q be only

is X +ve ??

[adeel]

sorry posted in the wrong forum should have gone to data sufficency

[arbiter]

here for x+3 to e positive , x can be either <=-3 or greater the 0. this do not give any definite x value.
hence A is the answer

[maihuna]

Q, Is X -ve number??

1, 9x > 10x


i.e if x =1/90

then 1 becomes 1/9 > 1/10

which is true
??

if x = 1/90 then 9x = 9/90 = 1/10
10x = 10/90 = 1/9

and 1/10 < 1/9 so 1 doesnt hold

[arbiter]

for 9x>10x, x has to be a negative number. thus a is the answer.

[enniguy]

Q, Is X -ve number??

then 1 becomes 1/9 > 1/10

Not True. It becomes 1/10 > 1/9 (Which doesnt hold)