# Mental Ability-Basic Arithmetic (NCO- Cyber Olympiad (SOF) Class 7): Questions 42 - 46 of 122

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 416 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 300.00 or

## Question number: 42

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

The ratio of the number of boys and girls in a college is 8: 9. If the percentage increase in the number of boys and girls were 20 % and 10 % respectively, what will be the new ratio?

### Choices

Choice (4) Response

a.

96: 99

b.

23: 24

c.

8: 9

d.

17: 18

## Question number: 43

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A cistern can be filled by two tapes A and B in 12 hours and 16 hours respectively. The full cistern can be emptied by a third tap C in 8 hours. If all the taps were turned on at the same time, in how much time will the empty cistern be filled up completely?

### Choices

Choice (4) Response

a.

36 hours

b.

40 hours

c.

24 hours

d.

48 hours

## Question number: 44

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

If 20 men working 7 hours a day can do a piece of work in 10 days, in how days will 15 men working for 8 hours a day to do the same piece of work?

### Choices

Choice (4) Response

a.

11.66 days

b.

55 days

c.

30 days

d.

12 days

## Question number: 45

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A cistern can be filled by two tapes A and B in 3 hours and 2 hours respectively. How much time will the cistern be filled up completely?

### Choices

Choice (4) Response

a.

3.07 hours

b.

2.4 hours

c.

1.2 hours

d.

3.6 hours

## Question number: 46

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A boat covers a certain distance downstream in 1 hour, while it comes back in 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.

12 kmps

b.

15 kmps

c.

14 kmps

d.

13 kmps

f Page