A and B finish the job in 15 days.while A,B and C can finish it in 6 days . C alone will finish the job in Options:
A) 10 days  B) 30 days  C) 60 days  D) 70 days  E) 50 days

Rationale: "explanation : 6 = ( 15 * x ) / ( 15 + x ) 90 + 6 x = 15 x 9 x = 90 x = 10 answer : option a"
Answer: A