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 Equation and Equation are any two rational numbers then we define:

Equation

Thus, subtracting a rational number means adding its additive inverse.

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

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 69

» Mental Ability » Basic Algebra

MCQ▾

Question

IfEquation and Equation be any two rational numbers then we define: Equation

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

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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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