Seed mixture X is 40 percent ryegrass and 60 percent : PS Archive
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# Seed mixture X is 40 percent ryegrass and 60 percent

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Seed mixture X is 40 percent ryegrass and 60 percent [#permalink]

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29 Oct 2008, 18:36
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Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of this mixture is X ?
(A) 10%
(B) 33.33 %
(C) 40%
(D) 50%
(E) 66.66 %

Anyone try the plug in number method for this one?
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29 Oct 2008, 19:01
Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of this mixture is X ?
(A) 10%
(B) 33.33 %
(C) 40%
(D) 50%
(E) 66.66 %

Anyone try the plug in number method for this one?

2/5x + 1/4y = 3/10(x+y)
0.4x - 0.3x = 0.3y - 0.25y
0.1x = 0.05y
x = 1/2y
2x = y

so (x+y) = 3x
x/3x = 1/3 = 0.3333 = 33.33%
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29 Oct 2008, 20:00
its always easier for me to use a chart....
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Book2.xls [13.5 KiB]

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30 Oct 2008, 05:24
Yup, that's why I did as well. But then I tried to plug in numbers insteds for x and y, but couldn't get anything to resemble 33%

bigtreezl wrote:
its always easier for me to use a chart....
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03 Nov 2008, 07:39
^bump. Anyone try pluggin in numbers?
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03 Nov 2008, 07:49
Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of this mixture is X ?
(A) 10%
(B) 33.33 %
(C) 40%
(D) 50%
(E) 66.66 %
Anyone try the plug in number method for this one?

.4X+0.25y=0.3(x+y)
0.1x=0.05y
x=0.05/0.1 or x=0.5y, then 0.5/1.5 or 5/15 *100 or 33.33%
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03 Nov 2008, 08:09
^bump. Anyone try pluggin in numbers?

there's no need for that.

amount of weaker mix*(new mix-weaker mix)=amount of stronger mix *(stronger mix-new mix)
y*(30-25)=x*(40-10)
5y=10x
y=2x

So, if total weight is 300, x is 100, which is 1/3, or 33.33%

there's no need to plug in no's, or even use decimals (I always mess up adding or multiplying them ) It's all about proportions
Re: PS: Seed Mixture   [#permalink] 03 Nov 2008, 08:09
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