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Don has x marbles. If y marbles are white, what percent of Don`s marbl

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Bunuel
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Don has x marbles. If y marbles are white, what percent of Don`s marbl [#permalink] New post   20 Aug 2018, 22:54
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Don has x marbles. If y marbles are white, what percent of Don`s marbles are NOT white?


A. 100x/(x−y)

B. 100(x−y)/x

C. (x−y)/(100x)

D. x/(100(x−y))

E. 100y/x
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B
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Re: Don has x marbles. If y marbles are white, what percent of Don`s marbl [#permalink] New post   20 Aug 2018, 23:38
Bunuel wrote:
Don has x marbles. If y marbles are white, what percent of Don`s marbles are NOT white?


A. 100x/(x−y)

B. 100(x−y)/x

C. (x−y)/(100x)

D. x/(100(x−y))

E. 100y/x


#of marbles(white+non-white)=x
Or, y+non-white=x
Or, #non-white=x-y

Percent of Don`s marbles that are NOT white=\(\frac{#non-white}{#Total-marbles}=\frac{x-y}{x}*100\)=\(\frac{100(x−y)}{x}\)

Ans. (B)
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Re: Don has x marbles. If y marbles are white, what percent of Don`s marbl [#permalink] New post   21 Aug 2018, 05:01
Bunuel wrote:
Don has x marbles. If y marbles are white, what percent of Don`s marbles are NOT white?


A. 100x/(x−y)

B. 100(x−y)/x

C. (x−y)/(100x)

D. x/(100(x−y))

E. 100y/x



Total Marble: x

White Marble = y

Non-White Marble = x - y .

\(\frac{(x - y)*100}{x}\)

The best answer is B.
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Re: Don has x marbles. If y marbles are white, what percent of Don`s marbl [#permalink] New post   21 Aug 2018, 11:52
Bunuel wrote:
Don has x marbles. If y marbles are white, what percent of Don`s marbles are NOT white?


A. 100x/(x−y)

B. 100(x−y)/x

C. (x−y)/(100x)

D. x/(100(x−y))

E. 100y/x


Non white marbles = \(x - y\)

So, Percentage on non white marbles = \(\frac{( x - y )}{x}100\), Answer must be (B)
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Re: Don has x marbles. If y marbles are white, what percent of Don`s marbl [#permalink] New post   23 Aug 2018, 17:04
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Bunuel wrote:
Don has x marbles. If y marbles are white, what percent of Don`s marbles are NOT white?


A. 100x/(x−y)

B. 100(x−y)/x

C. (x−y)/(100x)

D. x/(100(x−y))

E. 100y/x


Since Don has x total and y white marbles, he has (x - y) non-white marbles, so the percent of marbles that are not white is (x - y)/x *100 = 100(x - y)/x.

Answer: B
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Re: Don has x marbles. If y marbles are white, what percent of Don`s marbl [#permalink]
23 Aug 2018, 17:04
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