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Q
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...

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

27

B

24

C

12

D

6

E

9

A

27

B

24

C

12

D

6

E

9

Solution

Let, the total number of children in the class be = N1/3 of the children in a certain class are girls.Therefore,...

Let, the total number of children in the class be = N
1/3 of the children in a certain class are girls.
Therefore, remaining 2/3 children in the class must be boys.
Number of boys = 18
(2/3)N = 18
Therefore (1/3)N = 18/2 = 9

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