# Playing With Numbers (IMO- Mathematics Olympiad Class 6): Questions 65 - 72 of 86

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## Question number: 65

» Playing With Numbers

MCQ▾

### Question

The least number which when decreased by 7 is exactly divisible by 6, 7, 21 and 42 is

### Choices

Choice (4) Response

a.

53

b.

49

c.

35

d.

36

## Question number: 66

» Playing With Numbers

MCQ▾

### Question

HCF of the two numbers =

### Choices

Choice (4) Response

a.

Product of numbers × their LCM

b.

Product of numbers - their LCM

c.

Product of numbers + their LCM

d.

Product of numbers ÷ their LCM

## Question number: 67

» Playing With Numbers

MCQ▾

### Question

Which of the following is the pair that is not twin primes?

### Choices

Choice (4) Response

a.

(5, 7)

b.

(11, 13)

c.

(17, 19)

d.

(23, 29)

## Question number: 68

» Playing With Numbers

MCQ▾

### Question

The least number of square tiles that will be needed to pave a plot 225 m by 30 m is

### Choices

Choice (4) Response

a.

45 tiles

b.

15 tiles

c.

30 tiles

d.

25 tile

## Question number: 69

» Playing With Numbers

MCQ▾

### Question

The number (67, 54) are

### Choices

Choice (4) Response

a.

prime and co-prime

b.

Prime numbers

c.

Co-prime numbers

d.

Question does not provide sufficient data or is vague

## Question number: 70

» Playing With Numbers

MCQ▾

### Question

The number 11284 and 7655 when divided by a certain 3 digit number leave the same remainder. Find the number and the remainder

### Choices

Choice (4) Response

a.

190, 14

b.

180, 20

c.

191, 15

d.

195, 25

## Question number: 71

» Playing With Numbers

MCQ▾

### Question

The number (9, 8) are

### Choices

Choice (4) Response

a.

Co-prime numbers

b.

Prime numbers

c.

Prime and co-prime

d.

All of the above

## Question number: 72

» Playing With Numbers

MCQ▾

### Question

The least number of square tiles that will be needed to pave a plot 135 m by 15 m is

### Choices

Choice (4) Response

a.

12 tiles

b.

18 tiles

c.

9 tiles

d.

15 tiles

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