International Maths Olympiad Forum By SOF Olympiad Trainer - Page 416

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Subject :IMO    Class : Class 5

Ans 1:

Class : Class 5

Ans 2:

Class : Class 6
Reflex on board

Ans 3:

Class : Class 6
it should be b

Ans 4:

Class : Class 5
c reflex angle

Ans 5:

Class : Class 8
For me it is (C)

Ans 6:

Class : Class 5
it is c)

Ans 7:

Class : Class 7
How Reflex angle??? it is a right angle.

Ans 8:

Class : Class 5
I know you have this question from book of mtg imo class 5 chapter angles and question no. 10

Ans 9:

Class : Class 7
It should be Option C) because Obtuse Angle is always less than 180 but more than 90 and X shown in the figure is greater than 180 degree so it should be Reflex Angle

Ans 10:

Class : Class 4

Ans 11:

Class : Class 5
I want to go with answer c) Reflex Angle

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Subject :IMO    Class : Class 5

Ans 1:

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

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Subject :IMO    Class : Class 8

Ans 1:

Class : Class 9
C

Ans 2:

Class : Class 8
And is option C

Ans 3:

Class : Class 8
And is option C

Ans 4:

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

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Subject :IMO    Class : Class 8

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Subject :IMO    Class : Class 5

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Subject :IMO    Class : Class 5

Ans 1:

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

Ans 2:

Class : Class 8
B

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Subject :IMO    Class : Class 7

Ans 1:

Class : Class 7
the answer is wrong

Ans 2:

Class : Class 9

Ans 3:

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 4:

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

Ans 5:

Class : Class 8

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Subject :IMO    Class : Class 5

Ans 1:

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

Ans 2:

Class : Class 4
Let’s see what pattern is being followed by the numbers in the above grid. Let’s take the first column – 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. Let’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.

Ans 3:

Class : Class 8
D

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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 :)

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Subject :IMO    Class : Class 5

Ans 1:

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

Ans 2:

Class : Class 5
yes it should be 28 kg

Ans 3:

Class : Class 7
its c

Ans 4:

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 5:

Class : Class 5
the answer should be D.

Ans 6:

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

Ans 7:

Class : Class 5

Ans 8:

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

Ans 9:

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

Ans 10:

Class : Class 5
The Ans should be 28

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