International Maths Olympiad Forum By SOF Olympiad Trainer - Page 495

User Forum

Subject :IMO    Class : Class 7

Ans 1:

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

Ans 2:

Class : Class 7
the answer is wrong

Ans 3:

Class : Class 9

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 9

Post Your Answer

Subject :IMO    Class : Class 5

Ans 1:

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

Ans 2:

Class : Class 8
D

Ans 3:

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.

Post Your Answer

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 :)

Post Your Answer

Subject :IMO    Class : Class 5

Ans 1:

Class : Class 5

Ans 2:

Class : Class 5
the answer should be D.

Ans 3:

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

Ans 4:

Class : Class 8
Guys, that is not 25, it is 26. So, answer is 28

Ans 5:

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 6:

Class : Class 8

Ans 7:

Class : Class 5

Ans 8:

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

Ans 9:

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

Ans 10:

Class : Class 8
its c

Ans 11:

Class : Class 5
The Ans should be 28

Ans 12:

Class : Class 5
yes it should be 28 kg

Post Your Answer

Subject :IMO    Class : Class 8

Post Your Answer

Subject :IMO    Class : Class 8

Post Your Answer

Subject :IMO    Class : Class 8

Post Your Answer

Subject :IMO    Class : Class 8

Post Your Answer

Subject :IMO    Class : Class 8

Ans 1:

Class : Class 8

Ans 2:

Class : Class 10

Ans 3:

Class : Class 8

Post Your Answer

Subject :IMO    Class : Class 7

Ans 1:

Class : Class 8
answer is D....

Ans 2:

Class : Class 8

Ans 3:

Class : Class 10

Ans 4:

Class : Class 8
ya guys the answer is D

Ans 5:

Class : Class 9

Ans 6:

Class : Class 8
It is meant to be c

Ans 7:

Class : Class 7

Ans 8:

Class : Class 8
a is correct (ez)b is INCORRECT (angles can be same but size can vary)c is correct (bisect 60 degrees 3times)answer should be b

Ans 9:

Class : Class 9
both B and C are correct as angle 7.5 can be constructed using compass and ruler and we cant construct a unique triangle with only 3 angles given.

Ans 10:

Class : Class 8
Both B and C are wrong, so one of the options definitely needs do be changes. Someone please look into this.

Ans 11:

Class : Class 10
Answer is b as the length of sides of triangle are variable and therefore unique triangle cannot be constructed

Ans 12:

Class : Class 9

Ans 13:

Class : Class 5
The option b states that a unique triangle is constructed and it is possible to do so. However option c states that we CANNOT construct the angle 7.5. This is false cause it can be constructed by bisecting an angle of 60, three times.

Ans 14:

Class : Class 8
I mean B

Ans 15:

Class : Class 9
Aditya that is the very reason why it will be a unique triangle and option C is correct since it an angle such as that can be created by bisecting 60 degree three times

Ans 16:

Class : Class 8
ans is b.i agree with aditya

Ans 17:

Class : Class 7

Post Your Answer