# IMO- Mathematics Olympiad Class 8: Questions 98 - 104 of 1029

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## Question number: 98

MCQ▾

### Question

A number consists of two digits whose sum is 9. If 63 is subtracted to the number, the digits are interchanged. The number is_.

### Choices

Choice (4) Response

a.

82

b.

88

c.

18

d.

81

## Question number: 99

MCQ▾

### Question

A number consists of two digits whose sum is 5. If 9 is added to the number, the digits are interchanged. The number is_.

### Choices

Choice (4) Response

a.

32

b.

23

c.

88

d.

31

## Question number: 100

MCQ▾

### Question

The value of for which is_.

### Choices

Choice (4) Response

a.

7

b.

c.

6

d.

## Question number: 101

MCQ▾

Solve for

### Choices

Choice (4) Response

a.

9

b.

c.

2

d.

1

## Question number: 102

MCQ▾

### Question

A motor boat covers a certain distance downstream in a river in 1 hours. It covers the same distance upstream in 5 hours. The speed of the water is 6.0 km/hr. The speed of the boat in still water is_.

### Choices

Choice (4) Response

a.

9 km/hr

b.

19.5 km/hr

c.

5 km/hr

d.

11 km/hr

## Question number: 103

MCQ▾

### Question

A number 125 is divided into two parts in the ratio 2: 3. The product of the number is_.

### Choices

Choice (4) Response

a.

1550

b.

3750

c.

1250

d.

3211

## Question number: 104

MCQ▾

### Question

If the angles of a triangle are in the ratio 2: 4: 6, then the summation of the greatest and smallest angles is_.

### Choices

Choice (4) Response

a.

b.

c.

d.

60

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