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Five years ago at Laboratory B, the ratio of doctorate

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vinnik
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Five years ago at Laboratory B, the ratio of doctorate [#permalink] New post   28 Jan 2013, 08:08
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Five years ago at Laboratory B, the ratio of doctorate to nondoctorate researchers was 2:3. If no researchers have resigned, what is the current ratio?

(1) In the last 5 years, twice as many doctorates were hired as nondoctorates.

(2) 50 doctorates were hired during the last 5 years.

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E
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Re: Five years ago at Laboratory B, the ratio of doctorate [#permalink] New post   28 Jan 2013, 08:33
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Five years ago at Laboratory B, the ratio of doctorate to nondoctorate researchers was 2:3. If no researchers have resigned, what is the current ratio?

(1) In the last 5 years, twice as many doctorates were hired as nondoctorates.
(2) 50 doctorates were hired during the last 5 years.

Each statement alone is clearly insufficient to answer the question. When taken together we'll have that 50 doctorates and 25 nondoctorates we hired during the last 5 years. Now, if originally there were 2 doctorates and 3 nondoctorates, then the current ratio would be (2+50)/(3+25)=52/28 BUT if originally there were 4 doctorates and 6 nondoctorates, then the current ratio would be (4+50)/(6+25)=54/31. Not sufficient.

Answer: E.

Hope it's clear.
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Re: Five years ago at Laboratory B, the ratio of doctorate [#permalink] New post   30 Jan 2013, 22:50
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a sub 600 level question
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Re: Five years ago at Laboratory B, the ratio of doctorate [#permalink] New post   10 Apr 2020, 09:24
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From the question stem, we know the number of doctorate is 2x (x is a variable) and the number of nondoctorate is 3x.
We are asked to answer the ratio after the change.


(1)
If the number of new hired is y.
The ratio after the change is

2x + y / 3x + 2y = the ratio (r)
The ratio changes as x and y change.
Insufficient.

(2)
If the number of new hired is y,
The ratio after the change is

2x + 50 / 3x + ?
Clearly insufficient.

(1) + (2)

2x + 50 / 3x + 100 = the ratio (r) .
The ratio changes as x changes.
Insufficient.
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Re: Five years ago at Laboratory B, the ratio of doctorate [#permalink] New post   28 Jan 2013, 08:46
Since we don't know the exact number of doctorate and nondoctorate researchers the answer couldn't be found.
The answer is E.
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Re: Five years ago at Laboratory B, the ratio of doctorate [#permalink] New post   02 Oct 2021, 20:42
No information given about how many/if doctorates resigned. Therefore, I&II combined Not Sufficient. ANS - E
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Re: Five years ago at Laboratory B, the ratio of doctorate [#permalink] New post   14 Apr 2024, 08:10
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: Five years ago at Laboratory B, the ratio of doctorate [#permalink]
14 Apr 2024, 08:10
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