# Mental Ability (NCO- Cyber Olympiad Class 7): Questions 68 - 72 of 205

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## Question number: 68

» Mental Ability » Basic Algebra

MCQ▾

### Question

If and are any two rational numbers then we define:

Based on the statement given above solve the following problem: Subtract from.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 69

» Mental Ability » Basic Algebra

MCQ▾

### Question

If and be any two rational numbers then we define:

Thus, subtracting a rational number means adding its additive inverse. Based on the statement given above solve the following Problem: Subtract from.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 70

» 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: 71

» Mental Ability » Basic Statistics

MCQ▾

### Question

Which one of the following numbers is exactly divisible by 11?

### Choices

Choice (4) Response

a.

2350

b.

2444

c.

3122

d.

3905

## Question number: 72

» 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

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