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

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## Question 632

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### 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

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### 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

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MCQ▾

The graph of is

### Choices

Choice (4)Response
a.I
b.IV
c.II
d.III

## Question 635

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### 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.