International Maths Olympiad Forum By SOF Olympiad Trainer - Page 622

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Subject :IMO    Class : Class 6

Ans 1:

Class : Class 7
ANSWER IS 16!!!

Ans 2:

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 3:

Class : Class 8
Please correct the problem

Ans 4:

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

Ans 5:

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

Ans 6:

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

Ans 7:

Class : Class 10
the answer can be 31 and 13

Ans 8:

Class : Class 4

Ans 9:

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

Ans 10:

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

Ans 11:

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

Ans 12:

Class : Class 10

Ans 13:

Class : Class 9
The answer should be 16

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
Why do things like this ALWAYS happen with sof?

Ans 16:

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

Ans 17:

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 18:

Class : Class 10

Ans 19:

Class : Class 4
its wrong!!!

Ans 20:

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

Ans 21:

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

Ans 22:

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

Ans 23:

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 24:

Class : Class 5

Ans 25:

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

Ans 26:

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

Ans 27:

Class : Class 8

Ans 28:

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 29:

Class : Class 8

Ans 30:

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

Ans 31:

Class : Class 4
yes, and should be 32, which is not an option. Pl. correct this

Ans 32:

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

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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 7
class:

Ans 2:

Class : Class 9

Ans 3:

Class : Class 8
ss

Ans 4: (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.


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Subject :IMO    Class : Class 6

Ans 1:

Class : Class 7
No idea

Ans 2:

Class : Class 6
C IS THE ANSWER

Ans 3:

Class : Class 6

Ans 4:

Class : Class 7
No idea

Ans 5:

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.

Ans 6:

Class : Class 7
either a or d

Ans 7:

Class : Class 7
C is the answer...

Ans 8:

Class : Class 9
C is the ans

Ans 9:

Class : Class 7
No idea

Ans 10:

Class : Class 6
no idea bruh

Ans 11:

Class : Class 7
no idea

Ans 12:

Class : Class 6
C is the Answer

Ans 13:

Class : Class 7
Wrong

Ans 14:

Class : Class 6
Question is irrelevant?

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Subject :IMO    Class : Class 4

Ans 1:

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

Ans 2:

Class : Class 2
ya answer is A

Ans 3:

Class : Class 9
All sports

Ans 4:

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

Ans 5:

Class : Class 9
all sports

Ans 6:

Class : Class 4
the answer is a

Ans 7:

Class : Class 4
all sports

Ans 8:

Class : Class 4
its C

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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Subject :IMO    Class : Class 5

Ans 1:

Class : Class 5
wasnt it written clock wise in the question

Ans 2:

Class : Class 5
C

Ans 3:

Class : Class 6
c

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Subject :IMO    Class : Class 8

Ans 1:

Class : Class 3
I feel all options are wrong

Ans 2:

Class : Class 9
2nd option

Ans 3:

Class : Class 3
First option is wrong because a parallelogram is not always necessary to be a square or a rectangle ,as they only have diagonals equal. Second option is wrong because rectangle does not follow this property which can be checked by using SAS congruence criteria. Third option is wrong because if the diagonals of a quadrilateral intersect at right angles then it is necessarily a rhombus, if u are thinking that square also have this property then add up a point that every square is a rhombus. Fourth option is wrong because every quadrilateral is not necessarily be a trapezium, a parallelogram or a kite as concave quadrilaterals are none of them.

Ans 4:

Class : Class 8
c

Ans 5:

Class : Class 10

Ans 6:

Class : Class 3
Raunak Pandey yr answer is wrong , diagonals of a rectangle are not perpendicular

Ans 7:

Class : Class 8
@abin jose i agree

Ans 8:

Class : Class 10
third option is correct since in a kite, diagonals intersect at right angles and kite is not a rhombus. it does not talk about bisecting.

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