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# How many math majors are in Professor X’s physics class? (1) If Profes

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Math Expert
Joined: 02 Sep 2009
Posts: 49858
How many math majors are in Professor X’s physics class? (1) If Profes  [#permalink]

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13 Apr 2018, 02:00
00:00

Difficulty:

25% (medium)

Question Stats:

95% (01:08) correct 5% (01:58) wrong based on 27 sessions

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How many math majors are in Professor X’s physics class?

(1) If Professor X admits 10 more students into the class, and if all the newly admitted students are math majors, then the ratio of non-math majors to math majors would be 5 to 4.

(2) Currently, there are 25 non-math majors in Professor X’s class.

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Concentration: Social Entrepreneurship, General Management
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Re: How many math majors are in Professor X’s physics class? (1) If Profes  [#permalink]

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13 Apr 2018, 08:25
Bunuel wrote:
How many math majors are in Professor X’s physics class?

(1) If Professor X admits 10 more students into the class, and if all the newly admitted students are math majors, then the ratio of non-math majors to math majors would be 5 to 4.

(2) Currently, there are 25 non-math majors in Professor X’s class.

I)

m=no. of math major students
n=no. of non math major students

$$\frac{n}{m+10}$$ = $$\frac{5}{4}$$ ==> 4n-5m = 50

not sufficient

II) n=25

not sufficient

Using I & II m=10

Therefore ans C
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Re: How many math majors are in Professor X’s physics class? (1) If Profes  [#permalink]

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28 Apr 2018, 06:03
Let x be total student's
y=math major
x-y=non math major

I) as per statement
(x-y)/(y+10)=5/4

Two unknowns
Not sufficient

II)gives us the value of x-y

Combining both we can find value of y

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Re: How many math majors are in Professor X’s physics class? (1) If Profes &nbs [#permalink] 28 Apr 2018, 06:03
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# How many math majors are in Professor X’s physics class? (1) If Profes

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