C started the work and left after some days when 25 work was done After it D joined and completed it...........

Quantitative Aptitude (CPO) Data Table

NA refers the data which is not needed for a particular question. The number of working days of A, B, C, D is given below and some of them are missing. Take the data of the first row for the first question and the second row for the second question and so on.

A	B	C	D	Ratio	Total Number of Working Days
_	25	NA	NA	Efficiency (A : B) = 5 : 4	NA
_	_	_	NA	NA	_
16	64/5	32	NA	NA	NA
NA	NA	50	_	_	_
NA	9	8	3	NA	_

C started the work and left after some days, when 25% work was done. After it D joined and completed it working for 25 days. In how many days C and D can do the complete work, working together?

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Explanation:

Explanation :
Efficiency of C = (100/50) = 2%
Rest work = 75%
∴ Efficiency of D = 75/25 = 3%
∴ Combined efficiency of C and D = 5%
∴ Number of days required by C and D to work together = 100/5 = 20 days.