In a class of students, the ratio of girls to boys is 1:2. If 2 more girls joined the class, the ratio would be 2:3. How many students are in the class?  Pick one:  A) 18  B) 20  C) 22  D) 24  E) 26
Let x be the number of students in the class.   (1/3)*x=(2/5)(x+2)-2   5x=6x+12-30   x=18   The answer is 18.
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In a class of students, the ratio of girls to boys is 1:2. If 2 more girls joined the class, the ratio would be 2:3. How many students are in the class?