P and Q together can complete a project in 16 days, which Q and R together can complete it in 20 days. After P has been working at it for 4 days and Q for 7 days , R finishes it in 21 days. Then finf the number of days required by R alone if he works on it completely.
a. 14 days
b. 42 days
c. 36 days.
d. 35 days
Answers
Answered by
1
I think answer is 36 days
Answered by
1
its answer must be 36 days
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