# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 181 - 191 of 1042

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## Question 181

### Question

MCQ▾A number is multiplied by itself and then 10 is subtracted from the product. If the final result is 590, then find the original number.

### Choices

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

a. | 60 | |

b. | 36 | |

c. | 30 | |

d. | 50 |

## Question 182

### Question

MCQ▾Three numbers are in the ratio of 4: 3: 2. The sum of their cubes is 21384. The numbers are________.

### Choices

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

a. | ||

b. | 6: 12: 18 | |

c. | 15: 30: 45 | |

d. |

## Question 183

## Question 184

### Question

MCQ▾The value of is ________.

### Choices

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

a. | 4.00 | |

b. | 2.5 | |

c. | 7.5 | |

d. | 8.5 |

## Question 185

## Question 186

### Question

MCQ▾If , then the value of is________.

### Choices

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

a. | 11.1 | |

b. | 24.7 | |

c. | 22.7 | |

d. | 30.2 |

## Question 187

### Question

MCQ▾The cube of a number is four times of then find where

### Choices

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

a. | 1 | |

b. | 0 | |

c. | 2 | |

d. | 4 |

## Question 188

## Question 189

### Statement

True-False▾The sum of the cubes of first n natural numbers is equal to the square of their sum. This statement is true or not?

## Question 190

### Question

MCQ▾The cube root of is________.

### Choices

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

a. | 64 | |

b. | 4 | |

c. | 16 | |

d. | 8 |

## Question 191

### Question

MCQ▾In the five digit number 13ab-4, a is the greatest single digit perfect cube and a is greater four times of b. then find the sum of the number and its cube root is________.

### Choices

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

a. | 13848 | |

b. | 13820 | |

c. | 13825 | |

d. | 13824 |