### Discussion :: Arithmetic Reasoning - Section 1 (Q.No.21)

Ayush Choudhary said: (Aug 23, 2014) | |

I have not understand how to do this help me? |

Imran Ali said: (Sep 17, 2014) | |

Number of boys in the class say x. 18 are above 160cm and are constitute as 3/4 of the boys, hence 3/4*x = 18 ===> 24. Total number of student in the class say y. Total number of boys is 2/3 of the total number of student. 2/3y = 24 ===> y= 36. Number of girls in the class, Girls in the class = total student - total boys. Girls in the class = 36 - 24. Girls in the class = 12. Hence answer B is right. |

Mohit said: (Jan 15, 2017) | |

It's so easy guys. Let the num of student in class = x. Then num of boys = 2x/3, And num of girls = x - 2x/3 = x/3, Now given that (2x/3)(3/4) = 18, Hence x = 36. So, the num of girls = x/3 = 36/3 = 12. |

Lakshminarasimha said: (Jul 23, 2018) | |

3/4part is boy i.e 18 boys are 160cm. 3*6 = 18, 4*6 = 24. 2/3 part 2 part boys=24, Girl 1 part =12. |

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