International Maths Olympiad Forum By SOF Olympiad Trainer

Harsh from C. B. R. Modern Sr. Sec. School, Rewari

Subject :IMO Class : Class 8

DIRECTION : In the given diagram (not drawn to scale), the ratio of the area of circle A to the area of its hidden part is 5 : 2. The area of triangle B is twice as much as the area of circle A.

What is the area of the hidden part of circle A?

(A) 10 cm²

(B) 12 cm²

(C) 14 cm²

(D) 16 cm²
Area of A is 5/7 of 42

Ans 1:

ashashekhar from pis chinchwad, Pune

Class : Class 9

Ans 2:

Harsh from C. B. R. Modern Sr. Sec. School, Rewari

Class : Class 8

Ans 3:

Harsh from C. B. R. Modern Sr. Sec. School, Rewari

Class : Class 8

Ans 4:

ashashekhar from pis chinchwad, Pune

Class : Class 9

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Harsh from C. B. R. Modern Sr. Sec. School, Rewari

Subject :IMO Class : Class 8

Two positions of a dice are shown here. When 1 is at the top, which number will be at the bottom?

(A) 5

(B) 2

(C) 3

(D) 6
5 and 1 can be at there interchanged place then 3is opposite to 1

Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

(D): Number of dots on opposite faces are (2, 4), ( 1, 6), (5, 3).

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Debarka Das Gupta from Silchar Don Bosco School, Silchar

Subject :IMO Class : Class 7

The figure shows a trapezium PQRS whose lengths are in centimetres. If area of PQRS is 72 cm², find the value of x.

A 2
B 4
C 6
D 8

Ans 1:

Nayanaa Gupta from Modern Vidya Niketan Aravali Hills , Faridabad

Class : Class 8

Area of trapezium = 1/2 * h * (a+b) 72 = 1/2 * 6 * (4x+3x+10) 72 = 1/2 * 6 * (7x+10) 72 = 3 * (7x+10) 72 = 21x + 30 21x = 42 x = 42/21 x = 2 Thus, answer is A

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Arnav Raj Sharma from GEMS International School the ultra master mega, Gurgaon

Subject :IMO Class : Class 7

Find the value of

A

B

C

DNone of these

Ans 1:

Mrittika Roy from DPS Ruby Park, Kolkata

Class : Class 6

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Paridhi Umesh Kumar from Seven Square Academy, Thane

Subject :IMO Class : Class 7

Find the values of x and y respectively.

A 47°, 66°
B 66°, 48°
C 68°, 47°
D 47°, 68°

Ans 1:

Akashdeep Das from Gems Modern Academy, Dubai

Class : Class 8

obtion b is correct answer, SOF is right.

Ans 2:

Arnesh Chakraborty from M P Birla Foundation Higher Secondary School, KOLKATA

Class : Class 7

b is right

Ans 3:

Elantheeran Porkkovan from San Academy, Chennai

Class : Class 7

option a is right

Ans 4:

Hridhay Kanodia from WelhamBoysSchool, Bathinda

Class : Class 7

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Arpit Gupta from Pkr Jain , Ambala

Subject :IMO Class : Class 10

Match the following.

(P) Rational form of 0.32 is	(i)
(Q) Rational form of 0.254 is	(ii)
(R) Rational form of 0.12 is	(iii)
(S) Rational form of 0.24 is	(iv)

A (P) → (iii); (Q) → (iv); (R) → (i); (S) → (ii)
B (P) → (iv); (Q) → (i); (R) → (ii); (S) → (iii)
C (P) → (iii); (Q) → (i); (R) → (iv); (S) → (ii)
D (P) → (i); (Q) → (iii); (R) → (iv); (S) → (ii)

the question is not correct.data is missing

Ans 1:

Aditya from DPS, Bhopal

Class : Class 10

The table in the question has same value in (Q) and (S)

Ans 2:

A1403A from SKCH, Bangalore

Class : Class 7

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Mishika shah from little angels high school, gwalior

Subject :IMO Class : Class 5

The minimum number of match sticks that can be required to write 27 in roman number system is _______.

A8
B7
C6
D5

27 = XXVII Hence 8 sticks. Answer is option - (A)

Ans 1:

Mishika shah from little angels high school, gwalior

Class : Class 9

27 = XXVII Hence 8 sticks. Answer is option - (A)

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Raenessh Ghosh from Delhi Public School , Navi mumbai

Subject :IMO Class : Class 5

Nitin set off from Town A. After 2 hours 20 minutes later, he stopped at Town B for lunch. He then took another 2 hours 5 minutes to reach Town C. How long was his lunch break? (Give your answer in hours and minutes)

A 1 hr
B 2 hrs 25 mins
C 1 hr 25 mins
D 1 hr 35 mins