A pack of people can complete a certain amount of work in 12 days. Two times the same number of persons will complete half of the work in?

 

a. 12 days

b. 3 days

c. 4 days

d. 6 days

ANSWER: 3 days

Explanation:
More no of people: Less days (Inverse Relationship)

More work: More days (Direct Relationship)

Ratio is given:

Persons: 1 :: 2
Work 1 :: 1/2
Time 12 :: x

Solution of this can be explained by solving this ratio by the sort of relationships they possess with time.

1*1/2*12 = 2*1*x

=> x = 3 days