Quantitative Aptitude Mixture Problems

In a class the average age of boys is 25 years and the average age of girls is 18 years. If the average age of students in the class is 20 years, then find the ratio of the number of girls to the number of boys.

1

5 : 2

2

1 : 1

3

5 : 3

4

3 : 2

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