While ankurjohar's question is over 1.5 years old, I'll still answer it because that approach COULD have worked, but the work was incomplete...
Based on that user's initial steps....
$X = cost of 5 pounds of apples
$X/5 = cost of 1 pound of apples
Fact 2 tells us that 1 pound of pears costs 1.5 times the cost of 1 pound of apples.
With some Algebra, we have...
(X/5) = cost of 1 pound of apples
(3/2)(X/5) = cost of 1 pound of pears
3X/10 = cost of 1 pound of pears
At this point, ankurjohar assumed that this was insufficient, but there's still more work to do....
We now have a ratio that relates what $X will buy you in this situation:
$X buys you 5 pounds of apples
Since $(3/10)(X) buys you 1 pound of pears, $X will buy you 10/3 pounds of pears, so we CAN answer the question with this information.
Fact 2 is SUFFICIENT.
GMAT assassins aren't born, they're made,