International Maths Olympiad Forum By SOF Olympiad Trainer

Adi Mutha from Dr. Kalmadi Shamarao High School, Pune

Subject :IMO Class : Class 9

In the given figure, the area of the ∆ABC is

A 13.24 cm²
B 12.28 cm²
C 11.32 cm²
D 15.37 cm²

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Anirvesh A Nair from EuroSchool North Campus, Yelahanka, Bangalore, Bangalore

Subject :IMO Class : Class 4

Find the missing number, if a certain rule is followed in the given figure.

A342
B339
C456
D135

7 7 7 7 pattern

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aditya saha choudhury from Atreyee D.A.V. public school, Balurghat

Subject :IMO Class : Class 5

XXII workers are painting a fence. If each worker can paint X square metres of fence in an hour, then how many square metres can the workers paint in VIII hours?

AMDCCLX
BCCXXIII
CMDCCL
DCCXX

how to solve

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Ayush Agarwal from DPS NOIDA, Noida

Subject :IMO Class : Class 8

Count the number of cubes in the given figure.

A106
B110
C120
DNone of these

Wrong

Ans 1:

Ayush Agarwal from DPS NOIDA, Noida

Class : Class 10

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Sushama Saroj from Studyhall, Lucknow

Subject :IMO Class : Class 3

Anshul went to watch a show which started at quarter to six in the evening and ended at a quarter past 8. Anshul left the show 55 minutes before it ended and reach home at quarter to nine.
(A) At what time did Anshul leave the show?
(B) What was the duration of the show?
(C) How much time did he take to reach home?

	(A)	(B)	(C)
A	7 : 25 p.m.	2 hours 15 minutes	1 hours 30 minutes
B	7 : 20 p.m.	2 hours 30 minutes	1 hours 25 minutes
C	7 : 10 p.m.	1 hours 15 minutes	2 hours 15 minutes
D	7 : 05 p.m.	1 hours 30 minutes	2 hours 25 minutes

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Ans 1:

Aarav Singh from Kairos International School, Hyderabad

Class : Class 3

Ans 2:

Ved Kulkarni from vidya pratishthan's magarpatta city public school, Pune

Class : Class 3

Ans 3:

Prasanna Goswami from South Point School , Kolkata

Class : Class 4

Ans 4:

Anika Joshi from Pawar Public School, pune

Class : Class 3

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Manne Abhinay Dev from Sir CRR public school, Eluru

Subject :IMO Class : Class 5

A number is made up of 3 digits. The digit in the hundred's place is twice the digit in the one's place. The digit in the ten's place is 1 less than the digit in the one's place. If the digit in the ten's place is 2, what is the number?

A623
B432
C622
D224

I accidentally clicked wrong

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Angad Singh Marwaha from Shiv Nadar School, Noida

Subject :IMO Class : Class 10

Let ABC be a right angled triangle in which AB = 3 cm, BC = 4 cm and ∠B = 90°. BD is the perpendicular from B on AC. The circle through B, C, D is drawn.
Given below are steps of construction of tangents from A to this circle. Identify the wrong step. Steps of construction :
Step I : Draw ΔABC and perpendicular BD from B on AC.
Step II : Draw a circle with BC as a diameter. This circle will pass through D.
Step III : Let O be the mid point of BC. Join AO.
Step IV : Draw a circle with AO as radius. This circle cuts the circle drawn in step II at B and P.
Step V : Join AP. AP and AB are desired tangents drawn from A to the circle passing through B, C and D.

AOnly I
BOnly IV
COnly III
DOnly V

AO should be the diameter, and not the radius, hence Step IV is incorrect.

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SV YUVINRAJ from RISHS, MANGADU

Subject :IMO Class : Class 3

Mohan made the given picture graph to show the number of birds he counted on a field trip.

What is the total number of Starlings, Crows and Blue Jay Mohan counted?

A4
B8
C12
D16

while starting the test it shows only Robin birds to count. But while reviewing answer it shows above lot of birds to count

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Ans 1:

Mahith from nhps, bangalore

Class : Class 3

Ans 2:

Mahith from nhps, bangalore

Class : Class 3

POSIBLE OTHING IS IMPOSSIBLE IT IS BBBBBBBBBBBB

Ans 3:

Vishwesh Raul from Parle Tilak, Mumbai

Class : Class 4

this is impossible

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Sushama Saroj from Studyhall, Lucknow

Subject :IMO Class : Class 3

Mohan made the given picture graph to show the number of birds he counted on a field trip.

What was the total number of Robin birds that Mohan counted?

A4
B8
C12
D16

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Ans 1:

Sushama Saroj from Studyhall, Lucknow

Class : Class 3

Ans 2:

Mahith from nhps, bangalore

Class : Class 3

B

Ans 3:

Vedang Pandey from DPS SECTOR -45 GURUGRAM, Haryana

Class : Class 2

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Satyam Jha from , Muzaffarpur

Subject :IMO Class : Class 8

The thickness of a hollow metallic cylinder is 2 cm. It is 70 cm long with outer radius of 14 cm. Find the volume of the metal used in making the cylinder, assuming that it is open at both the ends. Also find its weight if the metal weighs 8 g per cm³.

A10440 cm³, 91250 g
B13440 cm³, 90000 g
C11440 cm³, 91520 g
DNone of these

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