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In certain year in Country C, x sets of twins and y sets of triplets

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In certain year in Country C, x sets of twins and y sets of triplets  [#permalink]

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New post 24 Jul 2016, 08:12
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In certain year in Country C, x sets of twins and y sets of triplets were born. If there were z total babies born in Country C in this year, and x and y were both greater than 0, which of the following represents the fraction of all babies born who were NOT part of a set of twins or triplets?

A. z - 2x - 3y
B. (2x+3y)/z
C. (x+y)/z
D. 1 - (2x+3y)/z
E. 1 - (x+y)/z

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In certain year in Country C, x sets of twins and y sets of triplets  [#permalink]

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New post 24 Jul 2016, 08:42
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Bunuel wrote:
In certain year in Country C, x sets of twins and y sets of triplets were born. If there were z total babies born in Country C in this year, and x and y were both greater than 0, which of the following represents the fraction of all babies born who were NOT part of a set of twins or triplets?

A. z - 2x - 3y
B. (2x+3y)/z
C. (x+y)/z
D. 1 - (2x+3y)/z
E. 1 - (x+y)/z


X set of twins implies 2x babies of twin category.
Y set of triplets means 3y babies of triplet category.

Let K be the babies other than twin or triplet category.

Total babies = z = 2x+3y+k.

or K=Z-(2x+3y)

=> Fraction of babies other than twin or triplet categories = K/Z = Z-(2x+3y)/Z.

= 1- (2x+3y)/Z. Hence answer is D.
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Re: In certain year in Country C, x sets of twins and y sets of triplets  [#permalink]

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New post 14 Nov 2018, 03:52
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: In certain year in Country C, x sets of twins and y sets of triplets &nbs [#permalink] 14 Nov 2018, 03:52
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