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Re: My comprehensive Quant Flashcards! [#permalink]
07 Jul 2011, 05:28

few typos, but otherwise very well formatted. Really like the slides on combinatorics & probability. Also going to do this at work!! Thanks MiguelMick!
_________________

How to improve your RC score, pls Kudo if helpful! http://gmatclub.com/forum/how-to-improve-my-rc-accuracy-117195.html Work experience (as of June 2012) 2.5 yrs (Currently employed) - Mckinsey & Co. (US Healthcare Analyst) 2 yrs - Advertising industry (client servicing)

Re: My comprehensive Quant Flashcards! [#permalink]
07 Jul 2011, 14:30

Well organized....

But for weighted average, I feel an alternative approach will be easy

Quote:

Percents and weighted averages Cereal K is 10% sugar and Cereal B is 2% sugar. What should be the ratio of them to produce a 4% sugar cereal? Technique: Pick a smart number for one of the quantities and call the other quantity x. For example, picking 100 grams for Cereal K: 100*0.1 + 0.02*x = 0.04(100 + x) 10 + 0.02x = 4 + 0.04x 0.02x = 6 x = 300 So, the ratio is 3 parts of Cereal B to each part of Cereal K, or 1:3

10k+2b=4(k+b) ==>6k=2b ==> k:b = 1:3

Quote:

Percent Change and Weighted Averages The revenue from pen sales was up 5%, but the revenue from pencil sales declined 13%. If the overall revenue was down 1%, what was the ratio of pen and pencil revenues? 105 + 0.87x = 0.99(100 + x) 6 = 0.12x x = 50 So, the ratio is 2:1