A) 21
B) 25
C) 50
D) 60
E) None of these
Correct Answer: B
Solution :
Explanation Option [b] is correct. Square of number at the bottom is equal to the product of two numbers at the top. i.e., \[{{6}^{2}}=4~9,\text{ }i.e.\text{ }36\] \[{{12}^{2}}=9~\times 16,\text{ }i.e.\text{ }144\] \[{{20}^{2}}=16\times ?,\text{ }i.e.\,400\] The missing number is \[400~\div 16=25\]
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