Mental Ability-Basic Arithmetic (NCO- Cyber Olympiad Class 7): Questions 34 - 41 of 122

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Question number: 34

» Mental Ability » Basic Arithmetic

MCQ▾

Question

The average of 3 results is 10 and that of the first two is 5. The third result is________.

Choices

Choice (4) Response
a.

1

b.

12.5

c.

20

d.

50

Question number: 35

» Mental Ability » Basic Arithmetic

MCQ▾

Question

400 liters of milk is divided in two parts having ratio X: 20, if the first part is 200 liters, find x.

Choices

Choice (4) Response
a.

20

b.

42

c.

39

d.

41

Question number: 36

» Mental Ability » Basic Arithmetic

MCQ▾

Question

Which of the following number is prime?

Choices

Choice (4) Response
a.

119

b.

247

c.

187

d. All a. , b. and c. are correct

Question number: 37

» Mental Ability » Basic Arithmetic

MCQ▾

Question

The ratio of the number of boys and girls in a college is 5: 6. If the percentage increase in the number of boys and girls be 10 % and 15 % respectively, what will be the new ratio?

Choices

Choice (4) Response
a.

5: 9

b.

21: 22

c.

8: 9

d.

23: 24

Question number: 38

» Mental Ability » Basic Arithmetic

MCQ▾

Question

Find the value of a in each of the following equations

11÷a10×0.2=11

Choices

Choice (4) Response
a.

0.5

b.

5.4

c.

0.6

d.

1.6

Question number: 39

» Mental Ability » Basic Arithmetic

MCQ▾

Question

An ore contain 5 % Iron. How many kilograms of the ore are required to get 70 kg of Iron?

Choices

Choice (4) Response
a.

1.44 kg

b.

850 kg

c.

544 kg

d.

1400 kg

Question number: 40

» Mental Ability » Basic Arithmetic

MCQ▾

Question

The average age of 20 children in a class is 8 years. If the teacher’s age is included, the average age becomes 10 years. Find the teacher’s age.

Choices

Choice (4) Response
a.

50

b.

42

c.

45

d.

35

Question number: 41

» Mental Ability » Basic Arithmetic

MCQ▾

Question

If the area of a triangle with base a is equal to the surface area of a cube with length of edge a , and then the altitude of the triangle is

Choices

Choice (4) Response
a.

12a

b.

a

c.

3a

d.

a2

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