A, B and C can do a job working alone in 10, 15 and 30 days respectively. They all work together for 1 day, then A and B quit. How many days C working alone will take to complete the remainder of the job?

A, B and C can do a job working alone in 10, 15 and 30 days respective

1.	A, B and C can do a job working alone in 10, 15 and 30 days respectively. They all work together for 1 day, then A and B quit. How many days C working alone will take to complete the remainder of the job?
A.	30
B.	18
C.	24
D.	12
Answer» D. 12

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A, B and C can do a job working alone in 10, 15 and 30 days respectively. They all work together for 1 day, then A and B quit. How many days C working alone will take to complete the remainder of the job?

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