question_answer

There are twenty bags each containing 10 bulbs and it is known that no bag contains more than 5 defective bulbs and 3 bags have 5 defective bulbs. 4 bags have atleast 4 defective bulbs, 5 bags have atleast 3 defective bulbs, 6 bags have atleast 2 defective bulbs and 7 bags have atleast 1 defective bulb. Then the ratio of total defective bulbs is to non-defective bulbs is ?

A) \[\frac{4}{7}\]

B) \[\frac{3}{7}\]    

C) \[\frac{2}{7}\]  

D) \[\frac{1}{7}\]