A started a work alone and then B joined her 5 days before actual completion of the work For how man...........

Quantitative Aptitude ( CCS) 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	_

A started a work alone and then B joined her 5 days before actual completion of the work. For how many days A worked alone?

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Explanation:

Explanation :
Efficiency (A : B) = 5 : 4
Number of days(A : B) = 4x : 5x = 4x : 25
∴ Number of days required by A to finish the work alone = 4x
= 4 x 5 = 20.
A and B work together for last 5 days = 5 x 9 = 45%
Efficiency of A = 5% and B’s efficiency = 4%
∴ No. of days taken by A to complete 55% work = 55/5 = 11days