From a group of boys and girls, 15 girls leave. There are then left 2 boys for each girl. After this, 45 boys leave. There are then 5 girls for each boy. Find the number of girls in the beginning?
Select the correct option:  A) 40  B) 10  C) 50  D) 30  E) 20
Let at present there be x boys.   Then, no of girls at present=5x   Before the boys had left: no of boys=x+45   40nd no of girls=5x   X+45=2*5x   9x=45   x=5   no of girls in the beginning=25+15= 
<gadget id="calculator">25+15</gadget>
<output>40</output>
40   40nswer is 40
<result>A</result>
From a group of boys and girls, 15 girls leave. There are then left 2 boys for each girl. After this, 45 boys leave. There are then 5 girls for each boy. Find the number of girls in the beginning?