Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number.
100 : 45 :: 200 : 70 : 300 : ?

Correct option is B

Given: 100 : 45 :: 200 : 70 : 300 : ?
Logic: 2nd $$\times$$​4 – 80 = 1st number
100 : 45 → 45$$\times$$ 4 – 80 = 180 – 80 = 100
and
200 : 70 → 70$$\times$$ 4 – 80 = 280 – 80 = 200
Similarly,
300 : ? → ?$$\times$$ 4 – 80 = 300
?$$\times$$ 4 = 300 + 80
?$$\times$$ 4 = 380
? = 95
Correct answer is (b) 95.