# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 632 - 635 of 931

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## Question 632

### Question

MCQ▾If the mean of 10 observations is 20 and that of another 15 observations is 16, then the mean of 25 observations is ________

### Choices

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

a. | 18.2 | |

b. | 17 | |

c. | 18 | |

d. | 17.6 |

## Question 633

### Question

MCQ▾There are four pillars W, X, Y and Z of different heights. Three spiders A, B, C and D start to climb on these pillars simultaneously. In one chance A climbs on W 10 cm but slips down 2 cm. B climbs on X 15 cm but slips down 7 cm. C climbs on Y 14 cm but slips down 6 cm. D climbs on Z 17 cm but slips down 11 cm. if each requires 70 chances to reach the top of the pillar, what is the height of the shortest pillar?

### Choices

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

a. | 637 cm | |

b. | 431 cm | |

c. | 562 cm | |

d. | 573 cm |

## Question 634

## Question 635

### Question

MCQ▾In the matrix there are eight designs and one space is left blank as shown by a question mark. Which answer figures will figures will replace the question mark?

### Choices

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

a. | ||

b. | ||

c. | ||

d. |