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by beat_gmat_09 » Thu Dec 16, 2010 4:01 am
Check this article by stacey-
https://www.beatthegmat.com/mba/2009/12/ ... art-2-of-2

Solution(follows steps in article)-
x = percentage of resultant solution

80(5)----x----120(10)

80=(10-x)/5 * 200
2=10-x
x = 8
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by GMATGuruNY » Thu Dec 16, 2010 4:21 am
blaster wrote:what is the fastest technique solving this kind of questions?

Image
I would just calculate:

.05*80 = 4.
.1*120 = 12.
(Combined acid)/(Total solution) = (4+12)/(80+120) = 16/200 = 8/100 = 8%.
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