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# To qualify for federal funding, a local school district must

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Manager
Joined: 28 May 2009
Posts: 155
Location: United States
Concentration: Strategy, General Management
GMAT Date: 03-22-2013
GPA: 3.57
WE: Information Technology (Consulting)
Followers: 7

Kudos [?]: 178 [0], given: 91

To qualify for federal funding, a local school district must [#permalink]

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07 Mar 2013, 10:02
00:00

Difficulty:

15% (low)

Question Stats:

75% (02:17) correct 25% (01:08) wrong based on 73 sessions

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To qualify for federal funding, a local school district must keep their ratio of certified teachers to non-certified teachers above $$9:2$$. If the school district employs a total of 600 teachers, what is the maximum number of non-certified teachers they can employ and qualify for federal funding?

(A) 99
(B) 109
(C) 111
(D) 116
(E) 133
[Reveal] Spoiler: OA

_________________
Magoosh GMAT Instructor
Joined: 28 Dec 2011
Posts: 3410
Followers: 1162

Kudos [?]: 5124 [0], given: 54

Re: To qualify for federal funding, a local school district must [#permalink]

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07 Mar 2013, 10:39
megafan wrote:
To qualify for federal funding, a local school district must keep their ratio of certified teachers to non-certified teachers above $$9:2$$. If the school district employs a total of 600 teachers, what is the maximum number of non-certified teachers they can employ and qualify for federal funding?

(A) 99
(B) 109
(C) 111
(D) 116
(E) 133

Dear megafan:
In all honesty, this is a tricky problem to do without a calculator. Remember, there's no calculator on the GMAT Quant. Dividing 600 by 11 is quite a challenge for folks to do in their heads if they are not mental math pros. It seems to me the ratio could be something like 11/4 and nothing would be lost conceptually in the problem, but it would be a slam-dunk for mental math. That, in my view, is closer to what the GMAT expects.
Mike
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Mike McGarry
Magoosh Test Prep

Manager
Joined: 24 Sep 2012
Posts: 90
Location: United States
GMAT 1: 730 Q50 V39
GPA: 3.2
WE: Education (Education)
Followers: 4

Kudos [?]: 121 [0], given: 3

Re: To qualify for federal funding, a local school district must [#permalink]

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07 Mar 2013, 10:40
Hello,

Let me try helping you with this one.
This problem states that the ratio of certified teachers to non certified teachers must be kept above 9:2 for the school to qualify for federal funding.
The total number of teachers is 600.
We need to find the maximum number of non certified teachers that can be employed so that the school still qualifies for federal funding.
Now, when we try to increase the ratio above the minimum stated ratio, our split up of teachers into the two categories changes so that the number of non certified teachers reduces.
For example, let us take the ratio to be the minimum ratio, 9:2. Thus the number of certified teachers=9x and the number of non certified teachers is 2x.
9x+2x=600
x=54.54
2x~109

If we increase the ratio to 10:2, our total number of teachers becomes=12x and the number of non certified teachers becomes 100.
12x=600
x=50
2x=100

Thus, any increase in the ratio will work towards reducing the number of non certified teachers. The minimum ratio of certified to non-certified teachers needs to be used in order to get the maximum number of non-certified teachers.
Hence, the maximum number of non certified teachers that the school can employ and still qualify for federal funding is 109.

Hope this helps! Let me know in case of any further question.

megafan wrote:
To qualify for federal funding, a local school district must keep their ratio of certified teachers to non-certified teachers above $$9:2$$. If the school district employs a total of 600 teachers, what is the maximum number of non-certified teachers they can employ and qualify for federal funding?

(A) 99
(B) 109
(C) 111
(D) 116
(E) 133
Math Expert
Joined: 02 Sep 2009
Posts: 34862
Followers: 6485

Kudos [?]: 82711 [0], given: 10116

Re: To qualify for federal funding, a local school district must [#permalink]

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08 Mar 2013, 03:39
megafan wrote:
To qualify for federal funding, a local school district must keep their ratio of certified teachers to non-certified teachers above $$9:2$$. If the school district employs a total of 600 teachers, what is the maximum number of non-certified teachers they can employ and qualify for federal funding?

(A) 99
(B) 109
(C) 111
(D) 116
(E) 133

"Stolen" GMAT Prep question:
Quote:
At a certain university, the ratio of the number of teaching assistants to the number of students in any course must always be greater than 3:80. At this university , what is the maximum number of students possible in a course that has 5 teaching assistants?

A. 130
B. 131
C. 132
D. 133
E. 134

Discussed here: at-a-certain-university-the-ratio-of-the-number-of-teaching-79240.html
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Re: To qualify for federal funding, a local school district must   [#permalink] 08 Mar 2013, 03:39
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