International Maths Olympiad Forum By SOF Olympiad Trainer - Page 651

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Subject :IMO    Class : Class 6

Ans 1:

Class : Class 4
Answer is B

Ans 2:

Class : Class 6
answer is 12W cm as the formula is 2*(length+breadth)=perimeter ,so w ( breadth) +5w (length) =6w (length+breadth) and then 6w *2 =12w(answer)

Ans 3:

Class : Class 8

Ans 4:

Class : Class 9
6w

Ans 5:

Class : Class 7
Breadth=w, Length is 5 times more, Therefore, length = 5w Therefore, perimeter=2(5w+w) =2*6w =12w Hence, b is the correct answer

Ans 6:

Class : Class 7
P=l+b×2 L=5w B=w =5w+w×2 =6w×2 =12w cm

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Subject :IMO    Class : Class 6

Ans 1:

Class : Class 9
The answer is d because 2/4 is smaller than 2/3.

Ans 2:

Class : Class 6

Ans 3:

Class : Class 6
yeah....crrct

Ans 4:

Class : Class 8
yeah

Ans 5:

Class : Class 7
But the shaded portion is equal in both the cases

Ans 6: (Master Answer)

Class : Class 1

The correct answer is D

 


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Subject :IMO    Class : Class 6

Ans 1:

Class : Class 5
yes, and should be 32, which is not an option. Pl. correct this

Ans 2:

Class : Class 10
division sign is both addition and subtraction....whyyyyyyy

Ans 3:

Class : Class 7
yes please correct. There are 2 division signs which represent addition n subtraction which leads to various answers

Ans 4:

Class : Class 10

Ans 5:

Class : Class 6
yes pls correct the problem...

Ans 6:

Class : Class 4

Ans 7:

Class : Class 5

Ans 8:

Class : Class 10

Ans 9:

Class : Class 8
there is problem in the question.....pls correct it

Ans 10:

Class : Class 8

Ans 11:

Class : Class 10
the answer can be 31 and 13

Ans 12:

Class : Class 9
This question is not correct, as the division symbol is used for both addition and subtraction.

Ans 13:

Class : Class 5

Ans 14:

Class : Class 6
There is problem in the Q as it mentions division sign represents both addition and substraction

Ans 15:

Class : Class 8
The divisions sign is used in 2 places, but I think it means subtraction because '-' meaning subtraction is not exactly coding anything...And in that case 20 8/4-3x2=20 2-6=16...Which is not an options for whatever weird reason

Ans 16:

Class : Class 7
Then the calculation will turn to 20 +8/4x3x2, =20+2x3x2, =20+6x2, =20+12 =32, so there is a problem in the question

Ans 17:

Class : Class 4
its wrong!!!

Ans 18:

Class : Class 6
Ya there is a problem...............answer is 32 you seee

Ans 19:

Class : Class 8
the division sign represents both addition and subtraction and we can get to different answers

Ans 20:

Class : Class 4
yes there is an error in the question

Ans 21:

Class : Class 8
There is a damn problem with this question .....Is this what I paid for?!?

Ans 22:

Class : Class 10
Yes there is a problem in the question

Ans 23:

Class : Class 8
Why do things like this ALWAYS happen with sof?

Ans 24:

Class : Class 8
There is a problem in this question. Please correct this.

Ans 25:

Class : Class 7
ANSWER IS 16!!!

Ans 26:

Class : Class 8
Please correct the problem

Ans 27:

Class : Class 9
WHY ARE YOU CONFUSING US AND WHY ARE YOU NOT PROVIDING CORRECT QUESTIONS AND WHY ARE YOU MAKING US LOSE OUR MARKS???????? SOF this is WRONG!!!!!!!!!!!!!!!!!

Ans 28:

Class : Class 8
actually! it is 32...........plz correct it

Ans 29:

Class : Class 10
yes there is a problem in the question

Ans 30:

Class : Class 9
How can you change 2 to 3? and how can you mark division symbol as addition and subtraction? SOF DON'T DO SUCH MISTAKES OR WE'LL HAVE TO REPORT IT TO sofworld.org

Ans 31:

Class : Class 8
answer should be 16 as - coded for subtraction doesn't really code anything so it is 22-6=16

Ans 32:

Class : Class 9
The answer should be 16

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Subject :IMO    Class : Class 10

Ans 1: (Master Answer)

Class : Class 1

The correct answer is C.

In ΔAED
AE D + ∠EAD + 90° = 180° (Angle sum property) 
⇒ ∠AED + ∠EAD = 90° 
⇒ ∠EAD = 90° – ∠AED ...(i) 
Also, ∠EAD = (50° + ∠AFB) ...(ii) (Exterior angle property) 
From (i) and (ii), we have 
50° + ∠AFB = 90° – ∠AED 
⇒ ∠AFB + ∠AED = 90° – 50° = 40° 
⇒ ∠AED + ∠CFD = 40°


Ans 2:

Class : Class 10
C

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Subject :IMO    Class : Class 5

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Subject :IMO    Class : Class 6

Ans 1:

Class : Class 9
class:

Ans 2: (Master Answer)

Class : Class 1

The correct answer is A.

In the 1st column, 2 X 1 + 1 = 3,

In the 2nd column, 12 X 9 + 9 = 117

Similarly, In the 3rd column, 7 X 14 + 7 = 105

Hence, the missing number is 7.


Ans 3:

Class : Class 9

Ans 4:

Class : Class 8
ss

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Subject :IMO    Class : Class 6

Ans 1:

Class : Class 7
either a or d

Ans 2:

Class : Class 6
C IS THE ANSWER

Ans 3:

Class : Class 6
Question is irrelevant?

Ans 4:

Class : Class 6

Ans 5:

Class : Class 6
no idea bruh

Ans 6:

Class : Class 7
Wrong

Ans 7:

Class : Class 7
No idea

Ans 8:

Class : Class 6
C is the Answer

Ans 9:

Class : Class 7
no idea

Ans 10:

Class : Class 7
No idea

Ans 11:

Class : Class 9
C is the ans

Ans 12:

Class : Class 7
No idea

Ans 13:

Class : Class 7
C is the answer...

Ans 14:

Class : Class 6
The first and third letters are interchanged, and their immediate next letter is taken. The 2nd, 4th and 6th letter are directly written without any change. Same happens to 5th and 7th letters. This is the pattern here.

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Subject :IMO    Class : Class 4

Ans 1:

Class : Class 2
ya answer is A

Ans 2:

Class : Class 4
all sports

Ans 3:

Class : Class 9
All sports

Ans 4:

Class : Class 9
all sports

Ans 5:

Class : Class 4
its C

Ans 6:

Class : Class 4
the answer is a

Ans 7:

Class : Class 8
very easy bro! the answer is a (all sports)

Ans 8:

Class : Class 5
Check the numbers then find the 4 in the ten thousand place

Ans 9:

Class : Class 6
A

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Subject :IMO    Class : Class 5

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Subject :IMO    Class : Class 2

Ans 1:

Class : Class 7
The correct answer is A

Ans 2:

Class : Class 7

Ans 3: (Master Answer)

Class : Class 1

The correct answer is A.

Fourth from the left end is  .

Third to the right of  is .


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