Arun and Tarun can do a work in 10 days.After 4 days tarun went to his village.How many days are required to complete the remaining work by Arun alone.Arun can do the work alone in 70 days.  Choose the correct choice from the following options
A) 16 days .	B) 17 days .	C) 18 days .	D) 19 days .	E) 42 days .

Rationale: "they together completed 4 / 10 work in 4 days . balance 6 / 10 work will be completed by arun alone in 70 * 6 / 10 = 42 days . answer : e"
Answer: E