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**Find answer of logical math question / puzzle / riddle:**

We have been given four
equations.

16 = 62

55 = 56

28 = 83

21 = ?

It is a logical riddle which
means hard math is not involved. We can simply solve such questions using our
mind. The solution of this question is simple. Use your mind to solve it &
if you are unable to find a correct answer or are not sure about your solution
then you can scroll down to see the solution & explanation.

**Answer logical math puzzle / riddle**

Let’s Go

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If your answer is 13 then you are
right.

See the pattern of this question.
We have been given two sides:

Left Hand Side = Right Hand Side

But values on both sides are
different hence it is a logical puzzle.

First Equation:

16 = 62

Now if you look at L.H.S. which
is equal to 16

Reverse order of L.H.S. = 61

Add 1 = 62

Hence 62 is equal to R.H.S.

Now using the same pattern in
Equation 2 & see whether our pattern is correct or wrong:

55 = 56

L.H.S. = 55

Reverse order of L.H.S. = 55

Add 1 = 56

Hence it is equal to R.H.S.

Now again checking our pattern in
third equation:

28 = 83

L.H.S. = 28

Reverse order = 82

Add 1 = 83

It is equal to R.H.S.

Now solving final equation:

21 = ?

L.H.S. = 21

Reverse order = 12

Add 1 = 13

Hence it is equal to R.H.S.

So

**Answer:**

**21 = 13**

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