In a class of students, the ratio of girls to boys is 1:2. If 3 more girls joined the class, the ratio would be 3:4. How many students are in the class? Choices:
A) 16	B) 18	C) 20	D) 22	E) 24
Let x be the number of students in the class.   (1/3)*x=(3/7)(x+3)-3   7x=9x+27-63   2x=36   x=18   The answer is 18.
<result>B</result>
In a class of students, the ratio of girls to boys is 1:2. If 3 more girls joined the class, the ratio would be 3:4. How many students are in the class?