Aptitude and Reasoning Questions

Q:

The minimum value of LCM of given numbers is ........... the product of all the given numbers.

A) always greater than B) always less than
C) always equal to D) None
 
Answer & Explanation Answer: D) None

Explanation:
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Filed Under: HCF and LCM
Exam Prep: Bank Exams

5 1786
Q:

The LCM of 16, 24, 36, 52 and 54 is?

A) 5618 B) 5216
C) 432 D) 5616
 
Answer & Explanation Answer: D) 5616

Explanation:
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Filed Under: HCF and LCM
Exam Prep: AIEEE , Bank Exams , CAT

5 1871
Q:

Find the L.C.M of 4/5, 2/3 and 5/7.

A) 25 B) 20
C) 40 D) 30
 
Answer & Explanation Answer: B) 20

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Filed Under: HCF and LCM
Exam Prep: Bank Exams

5 1046
Q:

The LCM of 14, 21 and 35 is

A) 7 B) 140
C) 70 D) 210
 
Answer & Explanation Answer: D) 210

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Filed Under: HCF and LCM
Exam Prep: Bank Exams

5 556
Q:

Find the largest number of three digits exactly divisible by 15, 18, 27 and 30.

A) 870 B) 900
C) 810 D) 780
 
Answer & Explanation Answer: C) 810

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Filed Under: HCF and LCM
Exam Prep: Bank Exams

5 851
Q:

5 + 2 x 10/2 = ?

A) 15 B) 35
C) 10 D) 20
 
Answer & Explanation Answer: A) 15

Explanation:

Using BODMAS Rule,

First solve division, mutiplication and Addition

So here 10/2 = 5

Then 2 x 5 =  10

Now, 5 + 10 = 15.

 

Hence, 5 + 2 x 10/2 = 15.

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Filed Under: Simplification
Exam Prep: AIEEE , Bank Exams , CAT , GATE
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5 2703
Q:

In a party there are male and female members. If 15 female quit then the number of females will become double the number of males. If 45 males quit no. of female becomes five times the number of males. Find the number of females ?

A) 175 B) 145
C) 165 D) 135
 
Answer & Explanation Answer: A) 175

Explanation:

Let the number of males be 'M'
Let the number of females be 'F'
From the given conditions,
(F-15)=2M.....(i)
F=5(M-45).....(ii)
By solving the equations (1) & (2) we get M = 80
Then substitute M = 80 in (1)
F = 2M + 15
F = 2 x 80 + 15
=> F = 175
Therefore, number of males = 80 and females = 175 in the party.

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5 2875
Q:

A secret can be told to only 3 persons in 3 minutes. Each person in turn tells 3 other persons in the next 3 minutes and the processes continues accordingly. In 30 minutes how many persons can be told this secret in this way ?

A) 88572 B) 77854
C) 99584 D) 55654
 
Answer & Explanation Answer: A) 88572

Explanation:

Given a secret is told to 3 persons in 3 minutes.
And if the process continues with each person saying 3 other persons,
In 30 minutes => the rocess for 10 times because each person time is 3 minutes.
Required number of persons = 3 + 32 + 33 + .... + 39 + 310

 

Now it forms a geometric progression,

 

Sum to n terms is S = arn - 1r - 1

 

Here a = 3, r = 3

 
=> 59048 x 3 /2

 

= 88572.

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5 3728