# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 777 - 780 of 931

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## Question 777

### Question

MCQ▾

In the following list of letters how many D՚s are followed by F but not preceded by E?

X M N D F P R S T D D F O C E D F B T E D K

### Choices

Choice (4)Response

a.

3

b.

1

c.

2

d.

4

## Question 778

### Question

MCQ▾

Which of the following numbers is present only in one figure?

### Choices

Choice (4)Response

a.

7

b.

3

c.

5

d.

4

## Question 779

### Question

MCQ▾

The owner of a plant nursery wanted to test the effectiveness of a new type of fertilizer. He measured the heights of 5 plants, and then gave each an equal amount of fertilizer. Two weeks later, he measured the heights of the plants again. The graph shows the height of the plants before and after the addition of fertilizer.

What was mean growth of the plants, to the nearest tenth of a centimeter?

### Choices

Choice (4)Response

a.

5.5 cm

b.

6 cm

c.

5 cm

d.

4.5 cm

## Question 780

### Question

MCQ▾

A milk vendor has 2 cans of milk. The first contains water and the rest milk. The second contains water. How much milk should he mix from each of the containers so as to get 20 liters of milk such that the ratio of water to milk is ?

### Choices

Choice (4)Response

a.

14.71 liters, 5.29 liters

b.

4.12 liters, 8.52 liters

c.

5.12 liters, 17.52 liters

d.

17 liters, 15 liters