Saturday, 22 February 2020

Missing number in box Reasoning problem, How to solve various box problems

Reasoning of missing number in box problems will be discussed with the help of 10 most important examples. Some of these examples are of  3 × 3  order and other are of  3 × 4 orders . 

Reasoning of missing number in box problems

PROBLEM #  1

Reasoning of missing number in box problem

Step 1. 

Subtract the number in first column from the number in third column of every row. i. e. C3 - C1 = S

Step 2 . 

Multiply the the above difference with 3 to get the numbers in second column of every row i. e. C2 = 3S.

1st row    3 (48 - 28 ) = 3 × 20  = 60
2nd row 3 (7 - 5)  = 2 × 3 = 6
3rd row 3(27 - 14) = 3 × 13 = 39
4th row 3( 16 - 7 ) = 3 × 9 = 27 
Hence required number is 27
Option (A) 27 is correct option

PROBLEM #  2

Reasoning of missing number in box problem

Every number in fourth row has been written as the square of all the numbers in 1st three rows in any particular column. 
Take the square of addition of  the elements of 1st three rows of 1st column like this
Square (1 + 4 + 2 ) = 7² = 49

Take the Take the square of addition of  the elements of 1st three rows of 1st column like this
(4 + 2 + 2 )² = 8² = 64

Take the square of addition of  the elements of 1st three rows of 1st column like this
 (? + 5 + 3 )² = (? + 8 )² = 169
(? + 8 )² = (13)² = 169 , Taking Square root
? + 8 = 13
? = 13 - 5 
? = 5
So required number will be 5
Option (C) 5 is correct option

PROBLEM #  3

Reasoning of missing number in box problem
Multiply all the numbers in the first three rows of every column and then divide the product by 2 to get the number in last row like this
(5×2×8)÷2 = 80÷2 = 40 ( Last number in 1st column ) 
(5×4×3)÷2 = 60÷2 = 30 ( Last number in 2nd column ) 
(2×1×10)÷2 = 20÷2 = 10 ( Last number in 3rd column ) 
So required number will be 10
Option (D)10 is correct option

PROBLEM #  4



Adding both the numbers in second and third rows then multiply it with the number in First row to get the number in last row ,the process will be  repeated for all the three columns
( 6 + 7 ) × 5 = 65
( 3 + 2 ) × 4 = 20
( ? + 4 ) × 9 = 45
This implies ( ? + 4 ) = 45/9 = 5
? = 5 - 4 = 1
Hence required number is 1
Option (A) 1 is correct option

PROBLEM #  5


Decrease the numbers in first  columns of every row by 1 then multiply it to get the number in third column of every row. 
1st Row  ( 8 - 1) ×  3  = 7 × 3 = 21
2nd Row  ( 6 - 1) ×  5 = 5 × 5 = 25
3rd Row  ( 12 - 1) ×  2 = 11 × 2 = 22
Hence required answer is 22
Option (B) 22  is correct option

PROBLEM #  6


Add 1st two rows of each column to multiply with the number in 3rd column to get fourth number in every row. 
(5 + 4 ) × 2 =  18 (1st column 3rd row ) 
(6 + 3 ) × 3 =  27 ( 2nd column 3rd row ) 
(12 + 4 ) × ? = 96 (3rd column 3rd row ) 
16 × ? = 96
? = 6
Hence required number is 6
Option (D) 6  is correct option

PROBLEM #  7



First of all multiply  1st three numbers  in every Column then add the sum of 1st three  numbers in every row to  get the numbers in 4th row. i. e. formula for this problem is [ if a, b ,c and d are numbers in any column  then d = abc + (a+b+c) ]
[ ( 3+4+5+(3×4×5 ) ] = 12 + 60 = 72
[ ( 2+5+6+(2×5×6 ) ] = 13 + 60 = 73
[ ( 5+9+1+(5×9×1 ) ] = 15 + 45 = 60
Hence  required number is 60
Option (D)60  is correct option

Also study these missing number series questions

PROBLEM #  8


Decrease both the numbers in first and second columns of every row then multiply the reduced numbers to get the numbers in third column of every row
{ 8 - 1 }×{ 6 - 1 } = 35
{ 6 - 1 }×{ 4 - 1 } = 15 
{ 7 - 1 }×{ 5 - 1 } = 24
Hence required number is 24.
Option (A)24  is correct option

PROBLEM #  9



Decrease the numbers in first column of every row and increase the numbers in second column of every row when multiplying both the reduced number of first and second column to get the numbers in third column of every row

{ 6 - 1 } × { 8 + 1 } =  45
{ 4 - 1 } × { 6 + 1 } =  21
{ 7 - 1 } × { 5 + 1 } = 36
Hence required number is 36
Option (C)36  is correct option

PROBLEM #  10



Total of 1st row is  3 + 6 + 8 = 17
Total of 2nd row is  5 + 6 + 8 = 17
Total of 3rd row is  4 + 7 + ? = 17
Therefore replacing ? with 6 to get required answer.
Option (D)6  is correct option

So these were the most important box problems for many competitive exams

  

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