501_06_331-370_501_master.qxd 4/29/13 12:38 PM Page 367
501 GMAT
®
Questions
367
287. Column 1, line 2. The question asks about the rate of decrease in
the numbers of Species X that would cause there to be the same
number of members of Species X and Species Y in 10 years and for
there to be fewer members of Species X than Species Y in
subsequent years. For column 1, line 1 is incorrect because this
would cause Species X to decrease by 200 members in 10 years,
which would equal the number of member of Species Y only if
Species Y did not decrease. Line 3 is incorrect because this would
cause Species X to decrease by 500 members in 10 years, which
would result in there being 300 members of Species X. Species Y
would have to decrease by 300 members in 10 years, and there is
no rate that supports this. Line 4 is incorrect because this would
cause Species X to decrease by 2,000 members in 10 years, which
would result in a negative number and so is not possible. Line 5 is
incorrect because this would cause Species X to decrease by 4,000
members in 10 years, which would result in a negative number and
so is not possible. Line 6 is incorrect because this would cause
Species X to decrease by 5,000 members in 10 years, which would
result in a negative number and so is not possible.
Column 2, line 1. The question asks about the rate of decrease in
the numbers of Species Y that would cause there to be the same
number of members of Species X and Species Y in 10 years and for
there to be more members of Species Y than Species X in
subsequent years. For column 2, line 2 is incorrect because this
would cause Species Y to decrease by 400 members in 10 years,
leaving 200 members of Species Y. There are no rates that would
result in there being 200 members of Species X in ten years. Line 3
is incorrect because this would cause Species Y to decrease by 500
members in 10 years, which would result in there being 100
members of Species Y. Species X would have to decrease by 700
members in 10 years, and there is no rate that supports this. Line 4
is incorrect because this would cause Species Y to decrease by
2,000 members in 10 years, which would result in a negative
number and so is not possible. Line 5 is incorrect because this
would cause Species Y to decrease by 4,000 members in 10 years,
which would result in a negative number and so is not possible.
Line 6 is incorrect because this would cause Species Y to decrease
by 5,000 members in 10 years, which would result in a negative
number and so is not possible.