Time and Work Questions
FACTS AND FORMULAE FOR TIME AND WORK QUESTIONS
1. If A can do a piece of work in n days, then A's 1 day's work =1n
2. If A’s 1 day's work =1n, then A can finish the work in n days.
3. A is thrice as good a workman as B, then:
Ratio of work done by A and B = 3 : 1.
Ratio of times taken by A and B to finish a work = 1 : 3.
NOTE :
Efficiency∝1No of time units
∴ Efficiency × Time = Constant Work
Hence, Required time = WorkEfficiency
Whole work is always considered as 1, in terms of fraction and 100% , in terms of percentage.
In general, number of day's or hours = 100Efficiency