31
Q:

A number of cats got together and decided to kill between them 999919 rats. Every cat killed an equal number of rats. Each cat killed more rats than there were cats. How many rats do you think that each cat killed ?

A) 1009 B) 991
C) 2000 D) 1000

Answer:   A) 1009



Explanation:

Given total number of rats = 999919

 

999919 = 1000000 - 81 = 10002 - 92 = (1000+9)(1000-9) = 1009 x 991.
Since there were more rats than there were cats, 991 cats killed 1009 rats each.

Subject: Math Puzzles
Exam Prep: GATE , CAT , Bank Exams , AIEEE
Job Role: Bank PO , Bank Clerk
Q:

Solve the following equations and find the value of abc?

 

A) 3 B) 6
C) 9 D) 12
 
Answer & Explanation Answer: B) 6

Explanation:

From the given equations,

(a+b+c)2=a2+b2+c2+2(ab+bc+ca)
(6)2=14 + 2(ab + bc + ca)
36 - 14 = 2(ab + bc + ca)
22/2 = ab + bc + ca
ab + bc + ca = 11

a3 + b3 + c3 - 3abc = (a + b + c)(a2 + b2 + c2 - ab - bc - ca)
= (6) (14 - 11)
=(6)(3)
=18

Since, a3 + b3 + c3 - 3abc = 18

36 - 3abc = 18

-3abc = 18 - 36

-3abc = -18

abc = 6.

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Filed Under: Math Puzzles
Exam Prep: Bank Exams , CAT

20 3292
Q:

Find the missing number in the following puzzle?

 

A) 86 B) 98
C) 104 D) 112
 
Answer & Explanation Answer: B) 98

Explanation:

Here the answer is 98.

 

The logic in the given puzzle:

2+3 = 8
3+7 = (7+2)x3 = 27
4+5 = (5+3)x4 = 32
5+8 = (8+4)x5 = 60
6+7 = (7+5)x6 = 72

Similarly,

7+8 = (8+6)x7 = 98.

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Filed Under: Math Puzzles
Exam Prep: Bank Exams

48 13062
Q:

Following the same logic, crack this mathematical puzzle ?

 

A) 4 B) 2
C) 1 D) 3
 
Answer & Explanation Answer: C) 1

Explanation:

The answer here is 1.

 

Logic Followed in the given puzzle ::

 

The logic here is the number of circles in each 4 digit number mentioned.

8801 has 5

5261 has 1

and so on

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Filed Under: Math Puzzles
Exam Prep: Bank Exams , CAT , GATE

15 12453
Q:

What value will replace the question mark in the puzzle?


A) 64 B) 56
C) 46 D) 36
 
Answer & Explanation Answer: C) 46

Explanation:

The Answer is 46.

Logic ::

First number on the right hand side is the second number in the left side of equation ( and ) second number on the right side is the sum of two numbers on the left side of the equation.

 

Hence, 2 + 4 = 4(2+4) = 46.

 

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Filed Under: Math Puzzles
Exam Prep: AIEEE , Bank Exams , CAT

15 1765
Q:

Solve the value of D?

Answer

A + B = 15 .... (1)


B x C = 84 .... (2)


C ÷ 4 = 3  .... (3)


B + D = 18 .... (4)


From (3), we get C = 12


From (2), we get B = 84/12 = 7


From (1), we get A = 15 - 7 = 8


From (4), we get D = 18 - 7 = 11


 


Hence, D = 11.

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Subject: Math Puzzles Exam Prep: Bank Exams
Job Role: Bank Clerk , Bank PO

20 2061
Q:

Can you solve this maths puzzle?


A) 10 B) 12
C) 14 D) 18
 
Answer & Explanation Answer: B) 12

Explanation:

The logic in this puzzle is summing the result of [subtraction of upper two digits] & [addition of lower two digits] 

Hence, the result is  

(5 - 3) + (2 + 8) = 2 + 10 = 12.

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Filed Under: Math Puzzles
Exam Prep: Bank Exams

18 1991
Q:

90% of people fail to solve this math puzzle?

ninety_percent_fail_to_answer_this1588595933.jpg image

A) 45 B) -20
C) 35 D) -60
 
Answer & Explanation Answer: D) -60

Explanation:

A - A - A = 20
B - B - B = 15
C - C - C = 25

A = -20
B = -15
C = -25

=> A + B + C = (-20)+(-15)+(-25) = -20 - 15 - 25 = -60.

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Filed Under: Math Puzzles
Exam Prep: CAT , Bank Exams
Job Role: Bank Clerk , Bank PO

17 2446
Q:

Can you solve this riddle?

A) 1 B) 3
C) 5 D) 0
 
Answer & Explanation Answer: A) 1

Explanation:

5 + 5 = 10

5x 2 + 2 = 12

5 x 2 - 1 x 5 = 5

 

Hence,  = 1.

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Filed Under: Math Puzzles
Exam Prep: CAT , Bank Exams

16 2348