1. Work Done = Time Taken × Rate of Work. Rate of Work = 1 / Time Taken. Time Taken = 1 / Rate of Work. If a piece of work is done in x number of days, then the work done in one day = 1/x.
 
2. Work Formula: Work (W) is calculated as the product of the rate of work (R) and the time (T) taken to complete the task:W=R×T. Rate of Work Formula: The rate of work (R) is the amount of work done per unit of time:R=TW
 
3. 
	
	Work from Days:
	If A can do a piece of work in 
n days, then A's 1 day's work = 1/n
	
Days from Work:
	If A's 1 day's work = 1/n, then A can finish the work in 
n days.
	
Ratio:
	If 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.