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by gmatblood » Sat Nov 05, 2011 9:54 am
90 students represent x percent of the boys at Jones Elementary School. If the boys at Jones Elementary make up 40% of the total school population of x students, what is x?

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by rijul007 » Sat Nov 05, 2011 10:01 am
(x/100)*(40/100)*x = 90
x^2 = 90000/4
x = 300/2 = 150

Option B
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by Anurag@Gurome » Sat Nov 05, 2011 10:02 am
gmatblood wrote:90 students represent x percent of the boys at Jones Elementary School. If the boys at Jones Elementary make up 40% of the total school population of x students, what is x?
--> x% of total boys = 90
--> x% of 40% of x = 90
--> (x/100)*(40/100)*x = 90
--> x² = 25*900
--> x = 5*30 = 150

The correct answer is B.
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by vaibhavgupta » Sat Nov 05, 2011 10:39 am
gmatblood wrote:90 students represent x percent of the boys at Jones Elementary School. If the boys at Jones Elementary make up 40% of the total school population of x students, what is x?

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B it is! just put the options into the question!
If OA is A, IMO B
If OA is B, IMO C
If OA is C, IMO D
If OA is D, IMO E
If OA is E, IMO A

FML!! :/
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