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?	Choose the correct option.
A) 125
B) 150
C) 225
D) 250
E) 500
90 = (x/100)*(# boys)   # boys = .4x   substitute and solve:   90 = (x/100)*(.4x)   9000 = .4(x^2)   25000 = x^2   x=150   Answer: 150
<result>B</result>
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?