# Number Systems (IMO- Mathematics Olympiad (SOF) Class 6): Questions 65 - 70 of 84

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## Question number: 65

» Number Systems

MCQ▾

### Question

ABC is a three digit number in which the digit A is greater than the digit B and C. If the difference between ABC and CBA is 297 and the difference between ABC and BAC is 450, find all possible three digit numbers ABC.

### Choices

Choice (4) Response

a.

724

b.

946

c.

835

d.

All a. , b. and c. are correct

## Question number: 66

» Number Systems

MCQ▾

### Question

The integer which is 5 less than is

### Choices

Choice (4) Response

a.

11

b.

c.

9

d.

2

## Question number: 67

» Number Systems

MCQ▾

### Question

The integer which is 7 more than is

### Choices

Choice (4) Response

a.

4

b.

- 10

c.

16

d.

- 4

## Question number: 68

» Number Systems

MCQ▾

### Question

There are 216 black balls in a basket. A boy takes out 8 black balls from it and replaces them by 16 white balls. He continues to do so, till all black balls are replaced by white balls. Find the number of white balls put in the basket?

### Choices

Choice (4) Response

a.

485

b.

654

c.

432

d.

462

## Question number: 69

» Number Systems

MCQ▾

### Question

If a, b and c are whole numbers such that b > a and c 0 and c > 3, then

### Choices

Choice (4) Response

a.

b.

c.

d.

None of the above

## Question number: 70

» Number Systems

MCQ▾

### Question

If are two whole numbers, then commutative law is applicable to multiplication if

### Choices

Choice (4) Response

a.

AND

b.

c.

d.

All a. , b. and c. are correct

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