International Maths Olympiad Forum By SOF Olympiad Trainer

Yashu from BVN, New Delhi

Subject :IMO Class : Class 7

A tank contains 18³⁄₇ litres of water. Due to leakage, ³⁄₅ of the water gets wasted. How much water is available for consumption?

A7¹³⁄₃₅ L
B10¹²⁄₃₅ L
C12¹⁄₁₇ L
D13²⁄₃₄ L

Correct answer is 624/35. Option does not exists

Ans 1:

abhimanyu from KVA, Raipur, Raipur

Class : Class 7

answer A is correct. find 2/5 of 18 3/7

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Vatsalya Jaiswal from MVN Sector 17, Faridabad

Subject :IMO Class : Class 6

Which one of the following statements is true?

(A) If a number is divisible by 3, it must be divisible by 9.

(B) If a number exactly divides the sum of two numbers, it must exactly divide the two numbers separately.

(C) A number is divisible by 18, if it is divisible by both 3 and 6.

(D) None of these
How can C be the correct answer as 12 is also divisible by both 3 and 6 and not divisible by 18

Ans 1:

Arnav Gulati from The Heritage School, Gurgaon

Class : Class 9

None of these should be answer. C can not be correct eg 24, it is divisible by both 3 and 6 but not by 18

Ans 2:

Rahul R from Bright Day school, Vadodra

Class : Class 8

None of these should be the answer

Ans 3:

Arnav gupta from DPS rohini, Delhi

Class : Class 7

None of these as 12 divisible by both 3 and 6 is not divisible by 18

Ans 4:

Shashwat S from Podar International School Chinchwad , Pune

Class : Class 7

Ans 5:

DANY JACOB SAJI from Christ Academy, Bangalore

Class : Class 7

The answer is D

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tarikadewangan from DPS EAST Bangalore , Bengaluru

Subject :IMO Class : Class 4

A Rs 6500
B Rs 3900
C Rs 4500
D Rs 5400

as per us it should be 6500. How we got 3900

Ans 1:

Saksham Chanani from Sri Sri Academy, Kolkata

Class : Class 9

The full question

Ans 2:

AYUSH SINGH from ryan international school, Mumbai

Class : Class 5

No , the answer is3900 only

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SUBODH KUMAR from Delhi Public School, Bokaro

Subject :IMO Class : Class 6

The diagram shows the floor plan of a room. Adjacent walls are perpendicular to each other. Letters a and b represent the lengths of some of the walls. The area of the room is

A3ab − a²
B2a²+ 3ab
C3ab
D3ab − 2a²

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Ans 1:

Sanket Kulkarni from Euroschool, Pune

Class : Class 8

Ans 2:

K Abhinav Narasimhan from modern senior secondary school nanganallur, Chennai

Class : Class 9

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Aarush shirbhate from Ins, Pune

Subject :IMO Class : Class 3

Which of the following abacus shows the number value that comes after solving following number sentence?
5934 - 2513

A
B
C
D

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is D.

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Nimmi from Sir mutha school, Chennai

Subject :IMO Class : Class 8

The least perfect square number which is divisible by 3, 4, 5, 6, 8 is ___. 

A 900
B 1200
C 2500
D 3600

1200 is divisible by 3,4,5,6and8

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Ans 1:

Kartik Jambur from Delhi Public School East, Bengaluru

Class : Class 8

1200 IS NOT A PERFECT SQUARE THEREFORE THE ANSWER IS 3600 HOPE IT HELPED!

Ans 2:

psr2017 from Mar Thoma Residential School, Thiruvalla, Kerala

Class : Class 9

3600

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Devashree from Nirmal, Ahmedabad

Subject :IMO Class : Class 5

A combination lock requires 3 numbers to unlock. The second number is 3/5 of the first number. The third number is 3/4 of the second number. The difference between the first number and the third number is 33. What is the second number?

(A) 60

(B) 36

(C) 27

(D) 14
what is the best way to solve above?

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

Consider the first number as x. The second number will be 3x/5. The third number will be (3/4)(3x/5). Now, the difference between first and third number is 33. Put the values into the equation and get the answer. The correct answer is B.