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by rishi235 » Mon Aug 18, 2008 9:17 pm
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!!!
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by warlock » Mon Aug 18, 2008 11:09 pm
thank you rishi235..
finally got the logic..
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by dbart06 » Tue Aug 19, 2008 12:12 pm
Not following how you got y=80/.4
Is the equation: (800-y).7=(800-y).6 or am I missing something
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by Suyog » Tue Aug 19, 2008 6:53 pm
@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?
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by dbart06 » Wed Aug 20, 2008 7:31 am
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
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by sudhir3127 » Wed Aug 20, 2008 9:04 am
dbart06 wrote: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
uptill this step ur right " 560-y=480-.6y "

take the 480 on the left hand side and Y on the right hand side

560-480 = -0.6y+Y
80 = Y( -0.6+1)

80 = 0.4Y

Y = 80/0.4 = 200

Hope its clear now..
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