Mental Ability-Basic Arithmetic (NCO- Cyber Olympiad Class 9): Questions 38 - 43 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

If (x-1) is factor of a2x23ax + 3a-1 , find the value of a.

Choices

Choice (4) Response

a.

±2

b.

±1

c.

±3

d.

±4

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.

1127×105

b.

1067×105

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

Question number: 43

» Mental Ability » Basic Arithmetic

MCQ▾

Question

Out of pair of complementary angles, one is two- third of the other. Find the angles.

Choices

Choice (4) Response

a.

One Angle = 54°, other Angle = 30°

b.

One Angle = 54°, other Angle = 36°

c.

One Angle = 55°, other Angle = 34°

d.

One Angle = 50°, other Angle = 36°

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