# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 815 - 819 of 929

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## Question number: 815

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MCQ▾

### Question

A student was asked to divide a number by 8 and add 16 to the quotient. He, however, first added 16 to the number and then divided it by 8, getting 160 as the answer. The correct answer should have been________

### Choices

Choice (4) Response

a.

174

b.

162

c.

154

d.

198

## Question number: 816

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MCQ▾

### Question

Reema bought pens at Rs. 2.60 each and y getting cards at 80 paise each. If the pens cost Rs. 12 more than the cards, the equation involving x and y are ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 817

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MCQ▾

### Question

P, Q and R enter into partnership by making investments in the ratio. After a year, R invests another Rs. 452500 while P withdrew Rs. 65400. The ratio of investments then changes to . How much did R invest initially?

### Choices

Choice (4) Response

a.

Rs. 225899

b.

Rs. 228900

c.

Rs. 228990

d.

Rs. 224516

## Question number: 818

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MCQ▾

### Question

The value of =________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 819

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MCQ▾

### Question

There are three pillars X, Y and Z of different heights. Three spiders A, B and C start to climb on these pillars simultaneously. In one chance A climbs on X 5 cm but slips down 1 cm. B climbs on Y 6 cm but slips down 3 cm. C climbs on Z 7 cm but slips down 2 cm. if each requires 50 chances to reach the top of the pillar, what is the height of the shortest pillar?

### Choices

Choice (4) Response

a.

153 cm

b.

152 cm

c.

144 cm

d.

141 cm