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simple but confusing

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by eloka » Mon Jun 07, 2010 10:58 pm
if increasing 20 by p percent gives the same result as decreasing 60 by p percent, what is p percent of 70?

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by liferocks » Mon Jun 07, 2010 11:06 pm
p% of 20=20p/100
p% of 60=60p/100

so,
20+20p/100=60-60p/100
or 80p/100=40
or p/100=1/2

p% of 70=70 * p/100 =70 * 1/2 =35

Ans 35
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by The Jock » Mon Jun 07, 2010 11:09 pm
Answer is 35...
First find the p% of 20 = 20p/100
Second p% of 60 = 60p/100
so according to question, 20 + (20p/100) = 60 - (60p/100)
solving will give you p= 1/2
so p% of 70 = 70 *1/2 = 35
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by sudi760mba » Mon Jun 07, 2010 11:25 pm
20 + p(20) = 20 + 20p
60 - p(60)= 60 - 60p

20 + 20p = 60-60p
80p = 40
p = 40/80 = 1/2

p% of 70 is 1/(2/100) = 1/200 * 70 = 70/200 = 7/20 = 35%
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by outreach » Tue Jun 08, 2010 12:31 am
20+(20p/100)=60-(60p/100)
80p/100=40
p=50

(50/100)*70=35
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