Note 1 : All the persons worked on the job X for whole number days.
Note 2 : Two jobs Y and Z are similar to job X and require same effort as required by job X.
A and C worked on job Y working alternatively for 10 days. B and D then worked together for 'x' day . if `(1)/(36)` of the job was still remained, then find the value of 'x' ?

Options

A. 2 days
B. `1(1)/(4)` days
C. `1(1)/(3)` days
D. 1 days

Explanation

As per given condition
`(5)/(10)+(5)/(15)+(x)/(12)+(x)/(18)=(1-(1)/(36))`
`(5x)/(36)=(35)/(36)-(5)/(6)`
`x=(36)/(5)((35-30)/(36))`
= 1 days.