Note that the company ratio for the number of full-timers to part-timers must
be between the corresponding ratios for Divisions X and Y if these ratios are not
the same.
(1) As Division's Y's ratio is below the company average, Division X's ratio
must be above the company average. SUFF
(2) Division X has more than half of the full-timers and less than half on the
part-timers, and Division Y has less than half of the full-timers and more
than half of the part-timers. Thus division X's ratio will be greater than
division Y's and thus Company Z's. SUFF
With algebra:
Suppose that the company has f full time employees and p part time employees, and that division x has a full-timers and b part-timers. Note that division y has f - a full-time employees and p - b part-time employees
We want to know whether a/b > f/p i.e. whether ap >bf
(1) (f - a)/(p - b) < f/p i.e. p(f - a) < f(p - b) or -pa < -fb or pa > bf SUFF
(2) a > f/2 b < p/2 thus a/f > 1/2 and b/p < 1/2 so a/f > b/p and ap > bf SUFF
Kevin Armstrong
GMAT Instructor
Gmatclasses
Madrid