In the Hillside summer camp there are 50 children. 90% of the children are boys and the rest are girls. The camp administrator decided to make the number of girls only 20% of the total number of children in the camp. How many more boys must she bring to make that happen?
Choose the correct option.
A) 35.  B) 45.  C) 40.  D) 30.  E) 25.
Given there are 50 students , 90% of 50 = 45 boys and remaining 5 girls.   Now here 90% are Boys and 10% are Girls.   Now question is asking about how many boys do we need to add, to make the girls percentage to or 20%..   If we add 35 to existing 45 then the count will be 80 and the girls number will be 20 as it.   Now boys are 80% and girls are 20%. ( out of 100 students = 80 boys + 20 girls ).   IMO option 35. is correct.
<result>A</result>
In the Hillside summer camp there are 50 children. 90% of the children are boys and the rest are girls. The camp administrator decided to make the number of girls only 20% of the total number of children in the camp. How many more boys must she bring to make that happen?