# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 477 - 481 of 931

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## Question 477

### Question

MCQ▾

The mean weight of 80 students in a class is 60 kg. The mean weight of boys is 70 kg while that of the girls is 50 kg. the number of boys and girls are________

### Choices

Choice (4)Response

a.

10,30

b.

40,40

c.

35,75

d.

45,35

## Question 478

### Question

MCQ▾

If ∠ A and ∠ B are complementary angles and m ∠ A is x˚, which equation can be used to find m ∠ B which is denoted by y?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 479

### Question

MCQ▾

A cloth merchant has announced rebate in prices. If one needs to have a rebate of ₹ 40, then how many shirts each costing ₹ 32, he should purchase?

### Choices

Choice (4)Response

a.

10

b.

6

c.

5

d.

7

## Question 480

### Question

MCQ▾

By selling a Car for ₹ 70000, a shopkeeper gains . If the profit is reduced to , then the selling price will be ________

### Choices

Choice (4)Response

a.

₹ 85000

b.

₹ 75000

c.

₹ 55000

d.

₹ 90000

## Question 481

### Question

MCQ▾

Choose the figure that is different from the rest?

### Choices

Choice (4)Response

a.

b.

c.

d.