The ratio of boys to girls in a school is 9 to 11. After 36 more girls join, the ratio becomes 9 to 13. How many boys are there in the school?	Answers
A) 102	B) 115	C) 132	D) 162	E) 234
Boys : Girls   9 : 11   let the boys be 9x and the girls be 11x. Now, 36 more girls are added -------&gt; 9:13(new ratio).   so,   9x/(11x+36) =9/13.   solving,   We get : x=18   so No. of boys in the school are :9x= 9*18= 
<gadget id="calculator">9*18</gadget>
<output>162</output>
162   hence (162)
<result>D</result>
The ratio of boys to girls in a school is 9 to 11. After 36 more girls join, the ratio becomes 9 to 13. How many boys are there in the school?