A can do 75 of a job in 18 days and B can do 25 of the job in 12 days If they work on it together in...........

Quantitative Aptitude (CGL) Time and work

A can do 75% of a job in 18 days and B can do 25% of the job in 12 days. If they work on it together, in how many days can they do 75% of the job?

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Explanation:

Person A:
75% = 18 days
100% = 18/75 x 100 = 24 days
Person B:
25% = 12 days
100 % = 12/25 x 100 = 48 days
Person A + Person B:
Total number of days = (48 x 24)/(48 + 24) = 16 days
Find 75% job completed:
75% x 16 = 0.75 x 16 = 12 days
They can finish 75% of the work in 12 days.