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mixture problem

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mixture problem

by sohailmbaprep » Tue Jun 12, 2012 8:43 am
Seed mixture X is 40% ryegrass and 60% bluegrass by weight;seed mixture Y is 25% ryegrass and 75%
fescue.If a mixture of X and Y contains 30% ryegrass ,what % of the weight of the mixture is X ?

I didn't understand the line in bold and how to answer this
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by GMATGuruNY » Tue Jun 12, 2012 8:54 am
I posted two approaches here:

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