# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 607 - 612 of 931

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## Question 607

### Question

MCQ▾The mean weight of 60 students in a class is 40 kg. The mean weight of boys is 50 kg while that of the girls is 30 kg. the number of boys and girls are________

### Choices

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

a. | 35,25 | |

b. | 20,40 | |

c. | 25,35 | |

d. | 30,30 |

## Question 608

### Question

MCQ▾A contractor employed 10 labourers at ₹ 60 each per day, 12 labourers at ₹ 40 each per day, 8 labourers at ₹ 20 each per day and 6 labourers at ₹ 10 each per day. The average wages paid is ________

### Choices

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

a. | ₹ 26 | |

b. | ₹ 60 | |

c. | ₹ 40 | |

d. | ₹ 36 |

## Question 609

### Question

MCQ▾A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, find the n umber of blue balls in the bag.

### Choices

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

a. | 15 | |

b. | 5 | |

c. | 10 | |

d. | 20 |

## Question 610

### Question

MCQ▾If , and then value of x, y, z when , is________.

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 611

### Question

MCQ▾Two coins are tossed simultaneously. The probability of getting at least one head is ________

### Choices

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

a. | ||

b. | ||

c. | ||

d. | 0 |

## Question 612

### Question

MCQ▾In a telephone directory which of the following names will appear in the third position

### Choices

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

a. | Mahinder | |

b. | Mahender | |

c. | Mahendra | |

d. | Mahindra |