# Mental Ability-Basic Arithmetic (NCO- Cyber Olympiad Class 7): Questions 33 - 39 of 122

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## Question number: 33

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Which of the following is in descending order?

### Choices

Choice (4) Response

a.

b.

, ,

c.

, ,

d.

None of the above

## Question number: 34

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

The average of 3 results is 10 and that of the first two is 5. The third result is________.

### Choices

Choice (4) Response

a.

1

b.

12.5

c.

20

d.

50

## Question number: 35

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

400 liters of milk is divided in two parts having ratio X: 20, if the first part is 200 liters, find x.

### Choices

Choice (4) Response

a.

20

b.

42

c.

39

d.

41

## Question number: 36

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Which of the following number is prime?

### Choices

Choice (4) Response

a.

119

b.

247

c.

187

d.

All a. , b. and c. are correct

## Question number: 37

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

The ratio of the number of boys and girls in a college is 5: 6. If the percentage increase in the number of boys and girls be 10 % and 15 % respectively, what will be the new ratio?

### Choices

Choice (4) Response

a.

5: 9

b.

21: 22

c.

8: 9

d.

23: 24

## Question number: 38

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Find the value of in each of the following equations

### Choices

Choice (4) Response

a.

0.5

b.

5.4

c.

0.6

d.

1.6

## Question number: 39

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

An ore contain 5 % Iron. How many kilograms of the ore are required to get 70 kg of Iron?

### Choices

Choice (4) Response

a.

1.44 kg

b.

850 kg

c.

544 kg

d.

1400 kg

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