# Average [NRA CGL (National Recruitment Agency-Combined Graduate Level) Mathematics]: Questions 20 - 23 of 25

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## Question number: 20

### Question

MCQ▾The average age of 80 students of a class is 20 years. When 20 new students are admitted, the average age is increased by 0.6 years. The average age of new students is (Paper- I)

### Choices

Choice (4) | Response | |
---|---|---|

a. | 24 years | |

b. | 23 years | |

c. | 25 years | |

d. | 22 years |

## Question number: 21

### Question

MCQ▾A cricketer has a certain average of runs for his 9 innings. In the tenth inning he scores 100 runs, thereby increasing his average by 5 runs. His new average of runs is (Paper- I)

### Choices

Choice (4) | Response | |
---|---|---|

a. | 56 | |

b. | 45 | |

c. | 55 | |

d. | 57 |

## Question number: 22

### Question

MCQ▾The distance between two stations P and Q is 500 km. A train starts from P and moves towards Q at an average speed of 20 km/hr. another train starts from Q at the same time and moves towards P at an average speed of 80 km/hr. How far from P will they cross each other?

### Choices

Choice (4) | Response | |
---|---|---|

a. | 600 km | |

b. | 100 km | |

c. | 525 km | |

d. | 350 km |

## Question number: 23

### Question

MCQ▾In a school with 1600 students, the average age of boys is 15 years and that of the girls is 14 years and 10 months. If the average age of the school is 14 years and 3 months, then the number of the girls in the school is

### Choices

Choice (4) | Response | |
---|---|---|

a. | 400 | |

b. | 700 | |

c. | 470 | |

d. | 300 |