5 : 7 :: ? : 28

Solution

The logic here is

7 x 4 = 28 $$\longrightarrow\ $$ $$\text{second number}\times4=\text{fourth number}$$

Similarly, $$\text{first number}\times4=\text{third number}$$

$$\therefore\ $$Third number = 5 x 4 = 20

Hence, the correct answer is Option A

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