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Krisp cereal is 10% sugar by weight. Brano cereal is 2% su [#permalink]

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23 Jun 2010, 18:34

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Krisp cereal is 10% sugar by weight. Brano cereal is 2% sugar by weight. If you wanted to make the mixture 4% sugar by weight what should the ratio of Krisp to Brano.

Re: Krisp cereal is 10% sugar by weight. Brano cereal is 2% su [#permalink]

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26 Jun 2010, 17:47

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Krispo is 10%. Bruno is 2%.

Question. Suppose we wanted the final solution to be 6% (not 4%). Because 6 is the midpoint between 10 and 2, wouldn't it then be clear that we would need the final solution to be half of each, and that ratio would be 1:1? It is helpful to visualize this on the number line:

2...6...10

Here we want the final solution to be 4%. So it looks like this:

2.4.....10

Because the grand average is skewed towards Bruno, in order to make the final solution 4%, clearly we need more Bruno than Krisp. In fact, because 4 is only 2 units away from 2 but 6 units away from 10, we need 6:2 or 3:1 as much Bruno as Krisp or 1:3 Krisp to Bruno.

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TAKEAWAY: The amount of skew is inversely proportional to the relative quantities of each item. If we have two groups, A, and B, then we have ("x" and "y" represent distance from the total average):

Average of A-------x-------Total average------y--------Average of B

(# in A)/(# in B) = y/x

This concept recurs fairly frequenly on the GMAT, especially in Data Sufficiency questions. If x and y are integers, then using this approach is quick and effective.

Re: Krisp cereal is 10% sugar by weight. Brano cereal is 2% su [#permalink]

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27 Jun 2010, 20:21

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Jinglander wrote:

Can someone walk me through this please

Krisp cereal is 10% sugar by weight. Brano cereal is 2% sugar by weight. If you wanted to make the mixture 4% sugar by weight what should the ratio of krisp to brano.

An Easier approach:

Attachment:

pic.JPG [ 3.37 KiB | Viewed 5025 times ]

Hence the ratio of quantities is 2:6=1/3
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Re: Krisp cereal is 10% sugar by weight. Brano cereal is 2% su [#permalink]

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15 Aug 2014, 11:21

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Re: Krisp cereal is 10% sugar by weight. Brano cereal is 2% su [#permalink]

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16 Aug 2015, 23:42

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Krisp cereal is 10% sugar by weight. Brano cereal is 2% su [#permalink]

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09 Apr 2016, 00:42

Jinglander wrote:

Krisp cereal is 10% sugar by weight. Brano cereal is 2% sugar by weight. If you wanted to make the mixture 4% sugar by weight what should the ratio of Krisp to Brano.

Say, w1 is the weight krisp, w2 is the weight of Brano

using weihted average formula w1/w2 = (c2 - avg) / (Avg-c1)

w1/w2 = 4-2 / 10-6 = 2/3

So Krisp and brano should be mixed in the ratio of 1/3.
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