Question 47

Select the number that can replace the question mark (?) in the following figure series.

Solution

The logic here is

$$12^2-8^2=144-64=80$$ $$\longrightarrow\ $$ $$\text{left number}^2-\text{right number}^2=\text{bottom number}$$

$$16^2-6^2=256-36=220$$ $$\longrightarrow\ $$ $$\text{left number}^2-\text{right number}^2=\text{bottom number}$$

Similarly, the required number = $$25^2-20^2=625-400=225$$

Hence, the correct answer is Option C

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