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Difficulty:
5%
(low)
Question Stats:
87% (01:38) correct
13%
(02:22)
wrong
based on 1580
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In a certain calculus class, the ratio of the number of math majors to the number of students who are not math majors is 2 to 5. If 2 more math majors were to enter the class, the ratio would be 1 to 2. How many students are in the class?
A. 10
B. 12
C. 21
D. 28
E. 35
A. 10
B. 12
C. 21
D. 28
E. 35
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21 Nov 2003, 14:41
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My way of solving:
The number of students is a multiple of seven. Rule out A and B.
That leaves C, D, and E: 21,28,35, or, 6/15, 8/20, 10/25.
To get 50% (a fraction that reduces to 1/2), you must have an EVEN denominator.
D is the only possible solution.
The number of students is a multiple of seven. Rule out A and B.
That leaves C, D, and E: 21,28,35, or, 6/15, 8/20, 10/25.
To get 50% (a fraction that reduces to 1/2), you must have an EVEN denominator.
D is the only possible solution.
