In a certain boys camp, 20% of the total boys are from school A and 30% of those study science. If there are 28 boys in the camp that are from school A but do not study science then what is the total number of boys in the camp?  Options:
A) 70 B) 245 C) 150 D) 200 E) 350
Since 30% of the boys from school A study science, then 70% of the boys from school A do NOT study science and since 20% of the total number of boys are from school A, then 0.2*0.7= 
<gadget id="calculator">0.2*0.7</gadget>
<output>0.14</output>
0.14, or 14% of the boys in the camp are from school A and do not study science.   We are told that this number equals to 28, so 0.14*{total}= 28 --&gt; {total} = 200.   Answer: 200.
<result>D</result>
In a certain boys camp, 20% of the total boys are from school A and 30% of those study science. If there are 28 boys in the camp that are from school A but do not study science then what is the total number of boys in the camp?