Find the missing number?

Question

Find the missing number?

A. 6
B. 7
C. 8
D. 5


Answer: D

Solution:

Sum of the squares of 1st two columns = Squares of 3rd column

1st Row

3² + 4² = 5²

=> 9 + 16 = 25

=> 25 = 25

L H S = R H S

2nd Row

6² + 8² = 10²

=> 36 + 64 = 100

=> 100 = 100

L H S = R H S

3rd Row

7² + 24² = 25²

=> 49 + 576 = 625

=> 625 = 625

L H S = R H S

4th Row

12² + ?² = 13²

=> 144 + ?² = 169

=> ?² = 169 -144

=> ?² = 25 , Taking square root on both sides

? = 5

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