GMAT PREP 2

warlock · Posted: Mon Aug 18, 2008 7:16 pm Post subject: GMAT PREP 2

OA = A

Can someone tell me the explanation to this question.

thank you

rishi235 · Posted: Mon Aug 18, 2008 9:17 pm Post subject:

Hi heres my solution:
According to the conditions given, we get the following equations:

70% of 800 - Y shud b equal to 60% of the total employees of the company

Now here v shud note that as Y employees r retiring, the total employees will also b reduced by Y

Hence we get the following equation:

70% of 800 - Y = 60% of (800-Y)
Solving v get Y = 80 / 0.4
Hence Y = 200....Hence Ans = A

Ur mistake was that u didn't negate Y from the RHS of the equation, in which case we get the ans as 80 (Which is wrong because of the reasons mentioned above)

Hope this helps!!!

warlock · Posted: Mon Aug 18, 2008 11:09 pm Post subject:

thank you rishi235..
finally got the logic..

dbart06 · Posted: Tue Aug 19, 2008 12:12 pm Post subject:

Not following how you got y=80/.4
Is the equation: (800-y).7=(800-y).6 or am I missing something

Suyog · Posted: Tue Aug 19, 2008 6:53 pm Post subject:

@dbart06

we have to take 70% of 800 then - y on LHS
and 60% (800-y) on RHS

I hope you will figure out now..right?

dbart06 · Posted: Wed Aug 20, 2008 7:31 am Post subject:

Still confused by method.

800(.7) - y = (800-y).6 => 560-y=480-.6y How is y = 200?

Sub 480 from 560 = 80, add y to rhs =-.5y = 80/.5 = 160

sudhir3127 · Posted: Wed Aug 20, 2008 9:04 am Post subject: