Mental Ability-Basic Arithmetic (NCO- Cyber Olympiad Class 9): Questions 8 - 13 of 49

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Question number: 8

» Mental Ability » Basic Arithmetic

MCQ▾

Question

The bacteria in a culture grows by 5% in the first hour, decreases by 10% in the second hour and again increases by 30% in the third hour. If at the end of the third hour the count of bacteria is 14000. The original count of bacteria in the sample is________

Choices

Choice (4) Response

a.

19199

b.

20199

c.

17199

d.

18199

Question number: 9

» Mental Ability » Basic Arithmetic

MCQ▾

Question

The ratio of the ages of Mayuri and Mayur is 4: 3. The sum of their ages is 28 years. The ratio of their ages after 8 years will be:

Choices

Choice (4) Response

a.

6: 5

b.

12: 17

c.

4: 7

d.

7: 4

Question number: 10

» Mental Ability » Basic Arithmetic

MCQ▾

Question

In a family, the father took 14 of the cake and he had 3 times as much as each of the other members had. The total number of family member is ________

Choices

Choice (4) Response

a.

3

b.

10

c.

7

d.

12

Question number: 11

» Mental Ability » Basic Arithmetic

MCQ▾

Question

loga+logb=log(a+b) Only if

Choices

Choice (4) Response

a.

a=bb1

b.

b=a(a1)

c.

a=b=1

d.

a=b21b

Question number: 12

» Mental Ability » Basic Arithmetic

MCQ▾

Question

3n+3+3(3n)3(3n+3) When simplified is

Choices

Choice (4) Response

a.

827

b.

3n+1+19

c.

1+3n

d.

3n+1

Question number: 13

» Mental Ability » Basic Arithmetic

MCQ▾

Question

A car travels 120 km from A to B at 30 km per hour but returns the same distance at 40 km per hour. The average speed for the round trip is closest to

Choices

Choice (4) Response

a.

36km/hr

b.

33 km/hr

c.

35km/hr

d.

34km/hr

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