The following table shows the daily seats occupancy in different classes of a train. Numbers in bracket represent the total seats available for a particular class.

What is the ratio of number of seats that remained vacant in all the Non-AC classes on Wednesday and Thursday taken together to number of seats remained vacant in AC classes on Monday, Tuesday and Friday?

Number of seats that remained vacant in all the Non-AC classes on Wednesday = (900 - 830) + (500 - 390) = 180

Number of seats that remained vacant in all the Non-AC classes on Wednesday = (900 - 790) + (500 - 480) = 130

Number of seats that remained vacant in AC classes on Monday = (500 - 480) + (250 - 240) + (150 - 145) = 35

Number of seats that remained vacant in AC classes on Tuesday = (500 - 450) + (250 - 230) + (150 - 120) = 100

Number of seats that remained vacant in AC classes on Friday = (500 - 500) + (250 - 210) + (150 - 130) = 60

Required ratio = (180 + 130) : (35 + 100 + 60)

= 310 : 195

= 62 : 39

Hence, the correct answer is Option D