## Ans 1:

## Ans 2:

## Ans 4:

## Ans 5:

Solution

Let age of Shilpa, Raj and Riya be S, R, and Ri respectively

Then

S = 4R

Ri = R - 6

S + R + Ri = 72

or

4R + R + R - 6 = 72

6R = 66

R = 11

S = 44

Ri = 5

So Shilpa is (44- 5) 39 years older than Riya

Subject :IMO Class : Class 4

Class : Class 4

let Raj be = x yrs, Shilpa = 4x, Riya = x-6 therefore x + 4x + x-6 = 72 or 6x = 78 or x = 13 This means Raj = 13 yrs, Shilpa = 4 x 13 = 52 yrs, and Riya = 13 - 6 = 7yrs thus Shilpa is 45 yrs older to Riya (52-7 = 45)

Class : Class 4

Riya is younger to Raj therefore she is also younger to Shilpa.
let Raj be 'x' . Shilpa = 4x and Riya is x-6. {x+ 4x + x-6 = 72} or 6x - 6 =72 or 6x = 78 or x= 13

Class : Class 7

Raj's age = x.
x + 4x + ( x - 6 ) = 72,
or 5x + ( x - 6 ) = 72,
or 5x + x - 6 = 72,
or 6x - 6 = 72,
or 6x = 72 + 6,
or 6x = 78
or x = 78/6
or x = 13, so Raj is 13 years old. Shilpa is 13 x 4 = 52 years old. Riya is 13 - 6 = 7 years old. Shilpa is 52 - 7 = 45 years older than Riya, so answer is B.

Class : Class 10

Answer: D

Solution

Let age of Shilpa, Raj and Riya be S, R, and Ri respectively

Then

S = 4R

Ri = R - 6

S + R + Ri = 72

or

4R + R + R - 6 = 72

6R = 66

R = 11

S = 44

Ri = 5

So Shilpa is (44- 5) 39 years older than Riya

Solution

Let age of Shilpa, Raj and Riya be S, R, and Ri respectively

Then

S = 4R

Ri = R - 6

S + R + Ri = 72

or

4R + R + R - 6 = 72

6R = 66

R = 11

S = 44

Ri = 5

So Shilpa is (44- 5) 39 years older than Riya

Class : Class 10

Shilpa_Age = 4* Raj_Age --- (1)
Riya_Age = Raj_Age - 6 --- (2)
Shilpa_Age + Raj_Age + Riya_Age = 72
This can be rewritten as, (from (1) and (2))
4*Raj_Age + Raj_Age + Raj_Age - 6 =72
6*Raj_Age = 78
Raj_Age = 78/6 = 13
Therefore,
Shilpa_Age = 4*13 = 52
Riya_Age = 13 - 6 = 7
Therefore, Shilpa is 52 - 7 = 45 years elder than Riya
Option (B)

Subject :IMO Class : Class 3

Class : Class 5

I had the same problem. 42.2 cm is given twice in the options and the answer is marked wrong if u choose one of them (I forget which one). Pls rectify this error.

Class : Class 10

Answer : D

There was a mistake in option B which has been corrected.

Solution

2 mm = .2 cm

42cm + 2 mm = 42cm + .2cm = 42.2cm

There was a mistake in option B which has been corrected.

Solution

2 mm = .2 cm

42cm + 2 mm = 42cm + .2cm = 42.2cm

Class : Class 10

Answer : D

There was a mistake in option B which has been corrected.

Solution

2 mm = .2 cm

42cm + 2 mm = 42cm + .2cm = 42.2cm

There was a mistake in option B which has been corrected.

Solution

2 mm = .2 cm

42cm + 2 mm = 42cm + .2cm = 42.2cm

Class : Class 10

Answer : D

There was a mistake in option B which has been corrected.

Solution

2 mm = .2 cm

42cm + 2 mm = 42cm + .2cm = 42.2cm

There was a mistake in option B which has been corrected.

Solution

2 mm = .2 cm

42cm + 2 mm = 42cm + .2cm = 42.2cm

Subject :IMO Class : Class 4

Class : Class 10

Answer : A

Solution

3,6,12 are three common factors of 36 and 96 which are also multiple of 3.

Hence the answer is 3 numbers.

The questions is 'how many numbers' and not 'which numbers'.

Solution

3,6,12 are three common factors of 36 and 96 which are also multiple of 3.

Hence the answer is 3 numbers.

The questions is 'how many numbers' and not 'which numbers'.

Class : Class 5

factors of 36 are 1,2,3,4,6,9,12,18,36
factors of 96 are 1,2,3,4,6,8,12,24,32,48,96
common 1,2,3,4,6,12
multiple of 3 - 3,6,12
ans is A

Class : Class 10

Answer : A

Solution

3,6,12 are three common factors of 36 and 96 which are also multiple of 3.

Hence the answer is 3 numbers.

The questions is 'how many numbers' and not 'which numbers'.

Solution

3,6,12 are three common factors of 36 and 96 which are also multiple of 3.

Hence the answer is 3 numbers.

The questions is 'how many numbers' and not 'which numbers'.

Class : Class 4

Ans is A
Factors of 36 & 96 are 2,3,6 &12
from the above three numbers are multiples of 3 i.e 3, 6, 12

Class : Class 5

No,its 3. The common factors are 1,2,3,4,6,12. But the factors that are also multiples of 3 are 3, 6 and 12

Class : Class 5

Answer : A Solution 3,6,12 are three common factors of 36 and 96 which are also multiple of 3. Hence the answer is 3 numbers. The questions is 'how many numbers' and not 'which numbers'.

Subject :IMO Class : Class 4

Subject :IMO Class : Class 4

Subject :IMO Class : Class 6

Subject :IMO Class : Class 5

Subject :IMO Class : Class 6

Subject :IMO Class : Class 7

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