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GMAT Club Tests | Re: M07-28

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eggybezos wrote:

Hi, I am confused in my approach, I always try to avoid algebra, so I used a weighted average method.

A = 20% and B =16.66%.

The final mixture is 18% (9:41 = 9/50 = 18/100)

As we can see, the final mixture is closer to B (1.3% vs 2%), therefore there must be more of B than A.

Judging from the answers, 16:25 matches up quite comically, as you get 13:20 = 16.x:25.

It's quite early and not sure where I'm making a mistake, would appreciate any clarity, thanks.

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Yes, everything there is accurate. However, 2:3 = 0.66..., and 1.33..https://gmatclub.com:443/forum/2 = 0.66... match exactly. The main point is that 2:3 = 0.66... and 16:25 = 0.64 are very close, so you can easily overlook the correct answer. Therefore, you need to be more precise.
 

Statistics : Posted by Bunuel • on 15 Sep 2014, 23:35 • Replies 8 • Views 43542



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