International Maths Olympiad Forum By SOF Olympiad Trainer - Page 640

# User Forum Subject :IMO    Class : Class 6

## Ans 1:

Class : Class 8
I THINK A. IS THE ANS

## Ans 2:

Class : Class 8
Any number remains the same on changing their order . There is a rule a * b = b * a . what is wrong ........... I think D is correct

## Ans 3:

Class : Class 6
B

Subject :IMO    Class : Class 4

Class : Class 5

## Ans 2:

Class : Class 6
actually,they are asking which one has the same relationship as 40 and 70 which is 10 and 40 so, B is the correct answer

## Ans 3:

Class : Class 8
SORRY THE ANSWER IS A

Class : Class 4

Class : Class 5

Class : Class 8

## Ans 7:

Class : Class 4
Common factors are 5 and 10 ie option B

## Ans 8:

Class : Class 4
The common factors of 40 and 70 are 2,5 and 10 which are same as common factors of 10 and 40. (2,5,10) and hence answer B is correct.

## Ans 9:

Class : Class 7
common factor is 5,10

## Ans 10:

Class : Class 8
common factor is 5,10

## Ans 11:

Class : Class 4
Common factor is 5,10

## Ans 12:

Class : Class 4
Sorry I wanted to type option number A.

## Ans 13:

Class : Class 9
common factors are 5 and 10

Subject :IMO    Class : Class 4

## Ans 1:

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

## Ans 2:

Class : Class 8
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.

## Ans 3:

Class : Class 5
The step written by you 4R + R + R - 6 = 72 6R = 66 This step is wrong. As 6 will be added to 72 and NOT SUBTRACTED. hence, 6R = 78

## Ans 4:

Class : Class 10
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 7
45 years

## Ans 6:

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)

## Ans 7:

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)

## Ans 8:

Class : Class 5
yes i am too getting 45.

Subject :NSO    Class : Class 8

## Ans 1: (Master Answer)

Class : Class 1

Subject :IMO    Class : Class 3

## Ans 1:

Class : Class 10
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 3
D

## Ans 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.

## Ans 4:

Class : Class 10
There was a mistake in option B which has been corrected.

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

## Ans 5:

Class : Class 10
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

## Ans 1:

Class : Class 10
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'.

## Ans 2:

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

## Ans 3:

Class : Class 8
I think that 3 and 6 both are factors of 36 and 96 and multiple of 3

## Ans 4:

Class : Class 10
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'.

## Ans 5:

Class : Class 9
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'.

Class : Class 4
so many

Class : Class 5
3

## Ans 8:

Class : Class 8
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

## Ans 9:

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

Subject :IMO    Class : Class 4

## Ans 1:

Class : Class 4
The correct answer must Hospital as 3/4 turn clockwise takes to the Cinema and Hospital is opposite of the Cinema. The answer will cinema if she takes anticlockwise turn instead of clockwise

Class : Class 4

## Ans 3:

Class : Class 5
may i please know how cinema hall is anti clockwise

## Ans 4:

Class : Class 8
cinema hall

Subject :IMO    Class : Class 4

## Ans 1:

Class : Class 3
Each Albrigi tank meets an operational philosophy based on nearly thirty years of experience in the production of stainless steel systems, which has guided the company towards the application of the most modern technologies and the most advanced construction techniques. The high quality standards, supported by the almost entirely robotized production structure, complete the maximum precision of processing and finishing. All Albrigi Tecnologie tanks are fully integrated with AISI 304, AISI 304L, AISI 316 and AISI 316L austenitic steel and comply with the second highest quality standard and the most restrictive norms of the sector (GMP, FDA, 3A). These processes are added to the guarantee of the steel, a particular effectiveness and speed in the operations of maintenance and cleaning, according to the legislation. In the last ten years Albrigi Tecnologie has specialized in the food sector in particular, providing high quality systems for famous brands in the industry such as Aia, Barilla and Zuegg. Its geographical location, in the heart of Valpantena, which is part of the so-called enlarged Valpolicella, where Amarone and Recioto is produced, has made it possible, however, that Albrigi Tecnologie immediately developed an attention for the wine sector, so much so that over the years it has become one of the most successful companies in Italy also in the construction of registered plants for the storage and fermentation of wines .. The owner is Stefano Albrigi who, after a long experience in the sector, has understood the importance of investing in technological development and in in-house professional skills. For this reason, around 35% of turnover is spent on research and business improvements. For Albrigi Tecnologie the search for ever new solutions is in the first place. Among the innovations recently proposed at the latest trade fairs (Vinitaly, Simei, Sitevi), we recall Il Archimede System, control and vinification system for automation in the cellar, Picturetank and Colourtank, for a touch of liveliness in the cellar and Polifascia, economic and innovative system, an exclusive Albrigi patent to condition your existing tanks

## Ans 2:

Class : Class 5
ACCORDING TO ME THE ANSWER SHOULD BE 3144 m,SINCE, 1300 m 272 m = 1572 m and 1572 m *2= 3144 m.PLEASE CHECK THE ANSWER.

Subject :IMO    Class : Class 6

## Ans 1:

Class : Class 8
36 and 25

Subject :IMO    Class : Class 5

Class : Class 6
D 1200

## Ans 2:

Class : Class 9
This is a wrong question.I calculated and got 17640.

## Ans 3:

Class : Class 5
i guess D 1200 but i don't know properly

## Ans 4:

Class : Class 8
The question is wrong.