Select the option that is related to the third number in the same way as the second number is related to the first number.
8 : 16 : : 20 : _____
Answer & explanation
Correct answer: option 2
Logic is : 2n : 4n. In this:
2 × 4 = 8
4 × 4 = 16, Same as:
2 × 10 = 20
4 × 10 = 40