Two boxes in front : Relate them.

Level 3

Each set of nine numbers relates to the other in a certain way. Work out the logic behind the numbers in the left-hand box in order to determine which number is missing from the right-hand box.

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The answer is 13.

2 solutions

Soumo Mukherjee
Mar 27, 2015

For left box

$3 \times 2 = 6$ ; $6+1=7$

$1 \times 4 = 4$ ; $4+1=5$

$2 \times 4 = 8$ ; $8+1=9$

For the right box

$6 \times 1 = 6$ ; $6+1=7$

$3 \times 4 = 12$ ; $\boxed{12+1=13}$

$1 \times 1 = 1$ ; $1+1=2$

Haha....interesting!!!

Noel Lo - 5 years, 10 months ago

Can't understand it fully

Rohit Udaiwal - 6 years, 2 months ago

Consider the left hand side box. The element in the 2nd row, 2nd column is $5$ . How can we get $5$ ? Which elements are used to get that $5$ ?

The number left to $5$ is $1$ (i.e., 2nd row, 1st column). The number right to $5$ is $4$ (i.e., 2nd row, 3rd column).

$1 \times 4 = 4$ . If we add $1$ we get $1+4=5$ ! . Does this pattern prevail throughout the left hand side box?

Consider the first row of the LHS-box. $3 \times 2=6$ . Now $6+1=7$ !

Does it also prevail in the right hand side box? Can we exploit this pattern to find the missing number in the right hand side box, in the 2nd row, 2nd column?

Plz tell me if you still have some doubt, I will try again

Soumo Mukherjee - 6 years, 2 months ago

Got that ...thnx

Rohit Udaiwal - 6 years, 2 months ago

Karan Gujar
Apr 4, 2015

wat can be more simple than this?

Two boxes in front : Relate them.

The answer is 13.

2 solutions

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