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It takes 3 people 4 days to build a garage.
A) How long does it take one person to build the garage?
B)How long does it take four people to build the garage?
C)How many people are needed to build the garage in 2 days?
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The entire job is 3*4 = 12 man-days.
From here
(a) one person will complete this job in 12:1 = 12 days;
(b) four persons will complete this job in 12:4 = 3 days;
(c) to make this job in 2 days, 12:2 = 6 persons are needed.
That's all.
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