# Mental Ability-Basic Arithmetic (NCO- Cyber Olympiad Class 9): Questions 38 - 42 of 49

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## Question number: 38

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Divide 45 among four parts such that 2 added to first part, 2 subtracted from second part, third multiplied by 2 and the fourth divided by2 are all equal.

### Choices

Choice (4) Response

a.

5, 8, 12, 20

b.

8, 12, 5, 20

c.

12, 8, 5, 20

d.

20, 5, 8, 12

## Question number: 39

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Ifis factor of , find the value of a.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 40

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

The bacteria in a culture grows by 7 % in the first hour, decreases by 6 % in the second hour and again increases by 5 % in the third hour. If at the end of the third hour the count of bacteria is 11270000. The original count of bacteria in the sample is________

### Choices

Choice (4) Response

a.

b.

c.

11270000

d.

None of the above

## Question number: 41

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

The sum of two angles of a triangles is 120° and their difference is 20°, find all the angles of the triangle.

### Choices

Choice (4) Response

a.

40°, 50°, 90°

b.

60°, 58°, 70°

c.

50°, 40°, 90°

d.

70°, 50°, 60°

## Question number: 42

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

How many liters of 30 % alcohol solution should be added to 50 liters of a 60 % alcohol solution to make a 40 % solution?

### Choices

Choice (4) Response

a.

100 liters

b.

80 liters

c.

40 liters

d.

60 liters

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