Exactly 1/3 of the children in a certain class are girls. If there

Question

Exactly 1/3 of the children in a certain class are girls. If there are 18 boys in the class, how many girls are in the class?

(A) 6
(B) 9
(C) 12
(D) 24
(E) 27

CounterSniper · Answer

This means 2/3 of the class are boys
2x/3=18
x=27
therefore, girls =9

ydmuley · Answer

Let x = Total No. Of students
Girls = 1/3 * x
Boys = 18

Boys = 1 - 1/3 = 2/3

2/3 * x = 18

x = 18 * 3/2

Substitute this value in Girls Equation

Girls = 1/3 * x

Girls = 1/3 * 18 * 3/2

Girls = 9

Hence, the answer is   = 9

Regards,
YM

Abhishek009 · Answer

\frac{2}{3}  of the children in a certain class are boys  = 18

So, Total Number of children in the class is  18*\frac{3}{2} = 27

Out of  27  Children  18  are boys , so no of girls is  9  ( ie,  18 - 7  )

Hence, the number of girls are in the class is (B) 9

ScottTargetTestPrep · Answer

Since 1/3 of the class are girls, 2/3 of the class are boys. So, if we let n = total students, we can create the following equation:

(2/3)n = 18

2n = 54

n = 27

Thus, there are 27 x 1/3 = 9 girls.

Answer: B

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