International Maths Olympiad Forum By SOF Olympiad Trainer

Rajendra Singvi from SHGS, Nandurbar

Subject :IMO Class : Class 7

If of a number is 45, what is of the same number?

(A) 5

(B) 25

(C) 30

(D) 81

explain

Ans 1:

Ashutosh Shrivastava from Campion School, Bhopal

Class : Class 7

Let number be Z. Then 9Z/5=45 so Z=45 X 5 / 9 Z= 25 Now 25 X 1/5 =5 So ans is A

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Jiyan Domadia from Podar International School , Rajkot

Subject :IMO Class : Class 4

A number that is less than 100 is a common multiple of 6 and 8, and a factor of 120. The difference between its digits is ______.

(A) 2

(B) 4

(C) 6

(D) 8
can you explain it ?

Ans 1:

Harsh Nitin Deshmukh from Vidyaniketan English Medium School (CBSE), Islampur, Islampur

Class : Class 4

yes that is correct

Ans 2:

aarav from GURUKUL THE SCHOOL, GHAZIABAD

Class : Class 7

multiples of 6 and 8 less than 100 are 24, 48,72 factor of 120 is 24 among above 3 difference between its digits= 4-2=2 answer is (a)

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ipchinmaya3 from Emmanuel Mission School, KOTA

Subject :IMO Class : Class 6

Jyoti was roasting a cake. It has been out of the oven for 20 minutes. The cake was roasting for 4 hours and 15 minutes. The oven was preheated for 10 minutes. If it is 5:00 now, then what time did Jyoti put the cake in the oven?

A12:25 p.m.
B12:35 p.m.
C12:50 p.m.
D2:30 p.m.

HOW IT WILL BE 12:25 PM

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Ans 1:

Vayun Gupta from National Public School HSR, Bengaluru

Class : Class 8

but you have to add another 10 minutes as the oven was preheated for 10 minutes in which the cake was not in the oven.

Ans 2:

VANSH Aggrawal from Surajkund International School, Faridabad

Class : Class 8

yes

Ans 3:

Ishita Asnani from St Joseph's Convent Sr. Sec. School, Bhopal

Class : Class 5

so, what"s the correct answer?

Ans 4:

MANNAT from ST. FRANCIS SCHOOL INDIRAPURAM GHAZIABAD, Ghaziabad

Class : Class 6

But the question says when jyoti put it in the oven so why did you deduct 20 minutes? it was just out of the oven, right?

Ans 5:

Ami Buch from DPS Gandhinagar, Gandhinagar

Class : Class 6

As the other options are p.m., 5:00 is also p.m. As the cake was left out for 20 min, 5:00 - 0:20 = 4:40 p.m. The cake was roasting for 4 hours 15 mins, 4:40 - 4:15 = 0:25. 0:25 p.m. is 12:25 p.m.

Ans 6:

Vayun Gupta from National Public School HSR, Bengaluru

Class : Class 8

but you have to add another 10 minutes as the oven was preheated for 10 minutes in which the cake was not in the oven.

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vedant maheshwari from presidency school, kishangarh

Subject :IMO Class : Class 8

Study the given statements and choose the correct option.
Statement 1 : A trinomial x2 + px + q can be factorised as (x + a) (x + b) = x2 + (a + b)x + ab, where a + b = p and ab = q.
Statement 2 : If (x + a) is the factor of a trinomial x2 + px + q then at x = a, the value of x2 + px + q is zero.

AStatement 1 is true and statement 2 is false.
BStatement 1 is false and statement 2 is true.
CBoth statements 1 and 2 are false.
DBoth statements 1 and 2 are true.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is D.

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SIDHARTH JAIN from GEMS MODERN ACADEMY, Dubai

Subject :IMO Class : Class 9

The construction of a triangle ABC, given that BC = 3 cm, ∠C = 60°, is possible when the difference of AB and AC is equal to

A3.2 cm
B3.1 cm
C3 cm
D2.8 cm

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Ans 1:

Ashish from DPS North, Bengaluru

Class : Class 9

D. 2.8 because the difference of any two sides of a triangle is lesser than the third side

Ans 2:

pinky from khs, Hyderabad

Class : Class 9

D

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Rajendra Singvi from SHGS, Nandurbar

Subject :IMO Class : Class 7

a businessmanborrowed some money

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Rajendra Singvi from SHGS, Nandurbar

Subject :IMO Class : Class 7

A businessman borrowed some money at 1% per month. After some time, he settled the debt by paying 14,750. If the total interest was 2950, find the time.
(a) 2 years 1 month
(b) 3 years
(c) years
(d) 1 year 8 months

explain

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Ans 1:

Swati from Ryan, Bengaluru

Class : Class 8

P=A-I =14750-2950 =11800 R= 1% PER MONTH = 12%PER YEAR T=(I*100)/(P*R) (2950*100)/(11800*12) =25/12 = 2 1/12 YEARS = 2 YEARS 1 MONTH

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Rajendra Singvi from SHGS, Nandurbar

Subject :IMO Class : Class 7

How many unit cubes are required to make it a cuboid?

(a) 18
(b) 30
(c) 28
(d) 26

explain

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Ans 1:

Swati from Ryan, Bengaluru

Class : Class 8

THE CORRECT OPTION IS A) 18

Ans 2:

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Class : Class 10

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Rajendra Singvi from SHGS, Nandurbar

Subject :IMO Class : Class 7

The figure is made up of 3 squares. What is the area of the shaded part of the figure? (figure not drawn to scale)

(a) 50 cm²
(b) 24 cm²
(c) 36 cm²
(d) 48 cm²

explain

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Ans 1:

Swati from Ryan, Bengaluru

Class : Class 8

THE CORRECT OPTION IS B)24cm2

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Rajendra Singvi from SHGS, Nandurbar

Subject :IMO Class : Class 7

The given question consists of two sets of figure. Figures P, Q, R and S consists of a problem set. There is a definite relationship between figures P and Q. Establish a similar relationship between Figure R and S by selecting a suitable figure from the options that would replace (?) in figure S.

(a)
(b)
(c)
(d)