From a group of boys and girls, 15 girls leave. They are then left 2 boys for each girl. After this, 54 boys leave. There are then 5 girls for each boy. Find the number of girls in the beginning  Choices
A) 20  B) 10  C) 30  D) 50  E) 45
Assume the number of boys at present = x   Then, the number of girls at present = 5x   Before the boys left, the number of boys were (x+54) and number of girls were 5x   Hence, 2(5x) = x + 54   =&gt; 10x = x + 54   =&gt; x = 6   Number of girls in the beginning = (5x + 15) = (5×6 + 15) = 45   Answer is 45.
<result>E</result>
From a group of boys and girls, 15 girls leave. They are then left 2 boys for each girl. After this, 54 boys leave. There are then 5 girls for each boy. Find the number of girls in the beginning