# Mental Ability-Basic Arithmetic (NCO- Cyber Olympiad (SOF) Class 9): Questions 16 - 21 of 49

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## Question number: 16

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Three years ago the average age of P and Q was 16 years. With R joining them, the average becomes 20 years. How old is R now?

### Choices

Choice (4) Response

a.

22 years

b.

34 years

c.

45 years

d.

12 years

## Question number: 17

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

A man had 25 lamps. All but 15 broken, how many were left with him?

### Choices

Choice (4) Response

a.

18

b.

7

c.

15

d.

10

## Question number: 18

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

In three colored boxes-pink purple, cyan orange and yellow aqua 180 balls are placed. There are twice as many balls in the orange and purple boxes combined as there are in the aqua box and twice as many in the aqua as there are in the purple box. How many balls are there in the orange box?

### Choices

Choice (4) Response

a.

60

b.

90

c.

46

d.

30

## Question number: 19

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

How many liters of silicon solution should be added to 70 liters of a silicon solution to make a solution?

### Choices

Choice (4) Response

a.

70 liters

b.

80 liters

c.

10 liters

d.

20 liters

## Question number: 20

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

In a family, the uncle took of the lava cake and he had 6 times as much as each of the other members had. The total number of family member is ________

### Choices

Choice (4) Response

a.

43

b.

31

c.

39

d.

21

## Question number: 21

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

The ratio of the ages of Neeta and Ravi is 2: 5. After 8 years, their ages will be in the ratio of 1: 2. The difference in their present age is: (in years)

### Choices

Choice (4) Response

a.

32

b.

24

c.

29

d.

26

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