# Mental Ability (NCO- Cyber Olympiad (SOF) Class 9): Questions 124 - 131 of 219

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## Question number: 124

» Mental Ability » Basic Algebra

MCQ▾

### Question

If is factor of , find the value of a.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 125

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Sterling gold is 92.5 % pure gold. How many grams of sterling gold must be mixed to a 90 % gold alloy to obtain a 500 gm of a 91 % gold alloy?

### Choices

Choice (4) Response

a.

100 gm

b.

50 gm

c.

150 gm

d.

200 gm

## Question number: 126

» Mental Ability » Basic Algebra

MCQ▾

### Question

What is equivalent to ?

### Choices

Choice (4) Response

a.

b.

c.

d.

10abc

## Question number: 127

» Mental Ability » Ranking Test

MCQ▾

### Question

Avinash is Ravi’s eldest brother. Ravi is younger than Ajay. Ravi and Ajay are not brothers. Which of the following statements is definitely true?

### Choices

Choice (4) Response

a.

Ajay is younger than Avinash

b.

Avinash is younger than Ajay

c.

Ajay is younger than Ravi

d.

None of the above

## Question number: 128

» Mental Ability » Basic Algebra

MCQ▾

### Question

If , find the value of

### Choices

Choice (4) Response

a.

322

b.

324

c.

323

d.

325

## Question number: 129

» Mental Ability » Basic Arithmetic

MCQ▾

### Question

Given, , and find the value of the following expression correct up to three places of decimal: .

### Choices

Choice (4) Response

a.

-17

b.

-12

c.

-10

d.

-30

## Question number: 130

» Mental Ability » Basic Algebra

MCQ▾

### Question

is a factorization product of

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 131

» 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

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