Students in Class I and II of a school are in the ratio of 3 : 5. Had 15 students leave the school from each class, the ratio would have become 1 : 2. How many total students were there in the beginning?  Pick one:
A) 120 B) 64 C) 96 D) 80 E) None
class 1 have 3x student and class 2 have 5x student.   3x-15/5x-15=1/2,6x-30=5x-15,x=15   45+75= 
<gadget id="calculator">45+75</gadget>
<output>120</output>
120 student   answer 120
<result>A</result>
Students in Class I and II of a school are in the ratio of 3 : 5. Had 15 students leave the school from each class, the ratio would have become 1 : 2. How many total students were there in the beginning?