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.	Choose the correct answer.
A) 36  B) 40  C) 56  D) 65  E) 28
Let the present boys be x boys.   Then the number of girls at present = 5x.   Before the boys had left : Number of boys = x + 45 and   number of girls = 5x.   x + 45 = 2 * 5x ===&gt; x + 45 = 10x ==&gt; 9x = 45, x = 5.   Hence, the number of girls in the beginning = 5x +15 = 25 + 15= 
<gadget id="calculator">25 + 15</gadget>
<output>40</output>
40   so the correct answer is option 40) 40.
<result>B</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.