If a person can do a piece of work in x days, then the person's 1 day's work = 1/x
Days from Work:
If a person's 1 day's work = 1/x, then the person can finish the work in x days..
Ratio:
If A is twice as good a workman as B, then:
Ratio of work done by A and B = 2 : 1.
Ratio of times taken by A and B to finish a work = 1 : 2.
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