International Maths Olympiad Forum By SOF Olympiad Trainer - Page 401

# User Forum Subject :IMO    Class : Class 5

## Ans 1:

Class : Class 6
(a) 3 hours 45 min 15 seconds

Subject :IMO    Class : Class 8

## Ans 1:

Class : Class 9
LET THE NUMBER BE X AND Y X-Y=1 X=Y+1 GIVEN X+Y=25 EQUATE X AS Y+1 Y+1+Y=25 2Y+1=25 2Y=24 Y=12 X=25-Y=13 ANSWER IS C-12,13

Class : Class 9
C

Class : Class 8
And is option C

## Ans 4:

Class : Class 8
And is option C

Subject :IMO    Class : Class 8

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Subject :IMO    Class : Class 5

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Subject :IMO    Class : Class 5

Class : Class 8
B

## Ans 2:

Class : Class 6
Be sure that you are clear and tell me the version of your computer as a question in general subject right now. also you can send it as an answer in this post

Subject :IMO    Class : Class 7

Class : Class 9

## Ans 2:

Class : Class 9
the answer is correct....your calculations might be wrong

## Ans 3:

Class : Class 7
the answer is wrong

## Ans 4:

Class : Class 9
TOTAL AREA OF FIGURE= 1/2 PI R^2= 1/2*14*14*22/7=308CM^2 AREA OF WHITE ARE= PI R^2 22/7*7*7=154 cm^2 THEREFORE RE O SHADED REGION= 308-154=154 CM^2 OPTION C IS CORRECT

## Ans 5:

Class : Class 8

Subject :IMO    Class : Class 5

## Ans 1:

Class : Class 4
Letâs see what pattern is being followed by the numbers in the above grid. Letâs take the first column â 7, 81, 2 If we add 1st and 3rd number = 7 2 = 9 And if we multiply 9 by 9 itself = 9 x 9 = 81. 81 is the 2nd number in the first column. Letâs see if the numbers in second column follow the same pattern. 9, 169, 4 We add 1st and 3rd number = 9 4 = 13 We multiply 13 by 13 itself = 13 x 13 = 169. 169 is the 2nd number in the second column. That means the numbers of third column will follow the same pattern. 11, ?, 6 We add 1st and 3rd number = 11 6 = 17 We multiply 17 by 17 itself = 17 x 17 = 289. 289 will be the missing number in the third column. So, the correct answer is Option D.

Class : Class 8
D

## Ans 3:

Class : Class 6
It is D because 11 6=17and 17x17 is 289.

Subject :IMO    Class : Class 6

## Ans 1:

Class : Class 8
option C is the answer as when you fold each of the other figures (opt. a, b, d), you will get the same cuboid as asked in the question. But in the third option, when you fold the figure along the lines, you will get a cuboid whose one face is missing..... So, this is the explanation :)

Subject :IMO    Class : Class 5

## Ans 1:

Class : Class 5
The Ans should be 28

Class : Class 5

Class : Class 7
its c

## Ans 4:

Class : Class 7
Guys, that is not 25, it is 26. So, answer is 28

## Ans 5:

Class : Class 6
Ans is C because the arrow is facing just after 2 small lines from 25 kg.

## Ans 6:

Class : Class 5
the answer should be D.

## Ans 7:

Class : Class 5
oh, it is actually 25 but it looks like 26.

## Ans 8:

Class : Class 4
it is not a math problem it is an eye test

## Ans 9:

Class : Class 6
(d) 28 kg Just use your brain. If you are using this app in a computer, then you can zoom in

## Ans 10:

Class : Class 5
yes it should be 28 kg