# IMO Level 1- Mathematics Olympiad (SOF) Class 10: Questions 373 - 379 of 968

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## Question 373

### Question

MCQ▾

The mean of 11 observations is 30. If the mean of the first 6 observations is 40 and that of the last 6 observations is 44, then the Sixth observation is ________

### Choices

Choice (4)Response

a.

174

b.

131

c.

137

d.

128

## Question 374

### Question

MCQ▾

The coordinates of the centre of a circle passing through is ________

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 375

### Question

MCQ▾

Find the area of triangle if the coordinates of vertices are is ________

### Choices

Choice (4)Response

a.

2 sq. units.

b.

5 sq. units

c.

9 sq. units

d.

3 sq. units

## Question 376

### Question

MCQ▾

Find the area of the quadrilateral, the coordinates of whose angular points taken in order are .

### Choices

Choice (4)Response

a.

8

b.

12

c.

10

d.

6

## Question 377

### Question

MCQ▾

Find the area of triangle if the coordinates of vertices are is ________

### Choices

Choice (4)Response

a.

45.2 sq. units

b.

20.5 sq. units.

c.

19.3 sq. units

d.

33.5 sq. units

## Question 378

### Question

MCQ▾

The mean weight of a class of 24 students is kg. if the weight of the teacher is included, the mean rises by 400 g. Then the weight of the teacher is ________

### Choices

Choice (4)Response

a.

65 kg

b.

50 kg

c.

55 kg

d.

45 kg

## Question 379

### Question

MCQ▾

The average temperatures of Monday, Tuesday, Wednesday and Thursday was . The average temperature of Tuesday, Wednesday, Thursday and Friday was . If the temperature on Monday was , then the temperature on Friday was ________.

### Choices

Choice (4)Response

a.

b.

c.

d.