# Mental Ability-Basic Arithmetic (NCO- Cyber Olympiad Class 7): Questions 80 - 86 of 122

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## Question number: 80

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A boat covers a certain distance downstream in 2 hour, while it comes back in 1 hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?

### Choices

Choice (4) Response

a.

15 kmps

b.

8 kmps

c.

11 kmps

d.

13 kmps

## Question number: 81

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

If each side of a square is doubled, its area

### Choices

Choice (4) Response

a.

Becomes 8 times

b.

Becomes 6 times

c.

Becomes 4 times

d.

Is doubled

## Question number: 82

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

What percent of is ?

### Choices

Choice (4) Response

a.

2.5%

b.

25%

c.

0.4%

d.

6.6%

## Question number: 83

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

The average age of 30 children in a class is 10 years. If the teacher’s age is included, the average age becomes 12 years. Find the teacher’s age.

### Choices

Choice (4) Response

a.

42

b.

72

c.

35

d.

45

## Question number: 84

» Mental Ability » Basic Arithmetic

MCQ▾

### Choices

Choice (4) Response

a.

2190

b.

19418

c.

5012.5

d.

19578

## Question number: 85

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A, B, C subscribe Rs. 60, 000 for a business. A subscribes Rs. 4000 more than B and B Rs. 3000 more than C. Then C’s share is________.

### Choices

Choice (4) Response

a.

Rs. 8400

b.

Rs. 11, 900

c.

Rs. 13, 600.50

d.

Rs. 16, 666.66

## Question number: 86

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A train 200 m long is running at a speed of In what time will it pass a bridge 100 m long?

### Choices

Choice (4) Response

a.

45.55 sec

b.

43.5 sec

c.

42.30 sec

d.

40.13 sec

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